diff --git a/.github/TODOLIST.md b/.github/TODOLIST.md
index 7302d426..aa6ac527 100644
--- a/.github/TODOLIST.md
+++ b/.github/TODOLIST.md
@@ -68,6 +68,8 @@
 
 - [ ] Refactor data structure of contentState, add copyBlock...
 
+- [ ] Refactor the History data structure
+
 ##### Documents
 
 - [ ] Manual
diff --git a/src/editor/contentState/arrowCtrl.js b/src/editor/contentState/arrowCtrl.js
index 5e18f933..6ea4cb88 100644
--- a/src/editor/contentState/arrowCtrl.js
+++ b/src/editor/contentState/arrowCtrl.js
@@ -3,60 +3,7 @@ import { isCursorAtFirstLine, isCursorAtLastLine, isCursorAtBegin, isCursorAtEnd
 import { findNearestParagraph } from '../utils/domManipulate'
 import selection from '../selection'
 
-const HAS_TEXT_BLOCK_REG = /^(h\d|span|th|td|hr|pre)/
-
 const arrowCtrl = ContentState => {
-  ContentState.prototype.firstInDescendant = function (block) {
-    const children = block.children
-    if (block.children.length === 0 && HAS_TEXT_BLOCK_REG.test(block.type)) {
-      return block
-    } else if (children.length) {
-      if (children[0].type === 'input' || (children[0].type === 'div' && children[0].editable === false)) { // handle task item
-        return this.firstInDescendant(children[1])
-      } else {
-        return this.firstInDescendant(children[0])
-      }
-    }
-  }
-
-  ContentState.prototype.lastInDescendant = function (block) {
-    if (block.children.length === 0 && HAS_TEXT_BLOCK_REG.test(block.type)) {
-      return block
-    } else if (block.children.length) {
-      const children = block.children
-      let lastChild = children[children.length - 1]
-      while (lastChild.editable === false) {
-        lastChild = this.getPreSibling(lastChild)
-      }
-      return this.lastInDescendant(lastChild)
-    }
-  }
-
-  ContentState.prototype.findPreBlockInLocation = function (block) {
-    const parent = this.getParent(block)
-    const preBlock = this.getPreSibling(block)
-    if (block.preSibling && preBlock.type !== 'input' && preBlock.type !== 'div' && preBlock.editable !== false) { // handle task item and table
-      return this.lastInDescendant(preBlock)
-    } else if (parent) {
-      return this.findPreBlockInLocation(parent)
-    } else {
-      return null
-    }
-  }
-
-  ContentState.prototype.findNextBlockInLocation = function (block) {
-    const parent = this.getParent(block)
-    const nextBlock = this.getNextSibling(block)
-
-    if (block.nextSibling && nextBlock.editable !== false) {
-      return this.firstInDescendant(nextBlock)
-    } else if (parent) {
-      return this.findNextBlockInLocation(parent)
-    } else {
-      return null
-    }
-  }
-
   ContentState.prototype.findNextRowCell = function (cell) {
     if (!/th|td/.test(cell.type)) throw new Error(`block with type ${cell && cell.type} is not a table cell`)
     const row = this.getParent(cell)
@@ -126,6 +73,7 @@ const arrowCtrl = ContentState => {
 
     if (show && (event.key === EVENT_KEYS.ArrowUp || event.key === EVENT_KEYS.ArrowDown)) {
       event.preventDefault()
+      event.stopPropagation()
       switch (event.key) {
         case EVENT_KEYS.ArrowDown:
           if (index < list.length - 1) {
@@ -147,6 +95,7 @@ const arrowCtrl = ContentState => {
       const anchorBlock = block.functionType === 'html' ? this.getParent(this.getParent(block)) : block
       let activeBlock
       event.preventDefault()
+      event.stopPropagation()
       switch (event.key) {
         case EVENT_KEYS.ArrowLeft: // fallthrough
         case EVENT_KEYS.ArrowUp:
@@ -236,6 +185,7 @@ const arrowCtrl = ContentState => {
 
       if (activeBlock) {
         event.preventDefault()
+        event.stopPropagation()
         const offset = activeBlock.type === 'p' ? 0 : (event.key === EVENT_KEYS.ArrowUp ? activeBlock.text.length : 0)
         const key = activeBlock.type === 'p' ? activeBlock.children[0].key : activeBlock.key
         this.cursor = {
@@ -258,6 +208,7 @@ const arrowCtrl = ContentState => {
       (preBlock && preBlock.type === 'pre' && event.key === EVENT_KEYS.ArrowLeft && left === 0)
     ) {
       event.preventDefault()
+      event.stopPropagation()
       const key = preBlock.key
       const offset = 0
       this.cursor = {
@@ -274,6 +225,7 @@ const arrowCtrl = ContentState => {
       (nextBlock && nextBlock.type === 'pre' && event.key === EVENT_KEYS.ArrowRight && right === 0)
     ) {
       event.preventDefault()
+      event.stopPropagation()
       const key = nextBlock.key
       const offset = 0
       this.cursor = {
@@ -289,6 +241,7 @@ const arrowCtrl = ContentState => {
       (event.key === EVENT_KEYS.ArrowLeft && start.offset === 0)
     ) {
       event.preventDefault()
+      event.stopPropagation()
       if (!preBlock) return
       const key = preBlock.key
       const offset = preBlock.text.length
@@ -302,6 +255,7 @@ const arrowCtrl = ContentState => {
       (event.key === EVENT_KEYS.ArrowRight && start.offset === block.text.length)
     ) {
       event.preventDefault()
+      event.stopPropagation()
       let key
       if (nextBlock) {
         key = nextBlock.key
diff --git a/src/editor/contentState/codeBlockCtrl.js b/src/editor/contentState/codeBlockCtrl.js
index d7e3c1ed..ffe23e12 100644
--- a/src/editor/contentState/codeBlockCtrl.js
+++ b/src/editor/contentState/codeBlockCtrl.js
@@ -2,7 +2,7 @@ import createDOMPurify from 'dompurify'
 import codeMirror, { setMode, setCursorAtLastLine } from '../codeMirror'
 import { createInputInCodeBlock } from '../utils/domManipulate'
 import { escapeInBlockHtml } from '../utils'
-import { codeMirrorConfig, CLASS_OR_ID, BLOCK_TYPE7, DOMPURIFY_CONFIG } from '../config'
+import { codeMirrorConfig, BLOCK_TYPE7, DOMPURIFY_CONFIG } from '../config'
 
 const DOMPurify = createDOMPurify(window)
 
@@ -72,9 +72,10 @@ const codeBlockCtrl = ContentState => {
     return !!match
   }
 
-  ContentState.prototype.pre2CodeMirror = function (isRenderCursor) {
+  ContentState.prototype.pre2CodeMirror = function (isRenderCursor, emptyPres) {
+    if (!emptyPres.length) return
     const { eventCenter } = this
-    const selector = `pre.${CLASS_OR_ID['AG_CODE_BLOCK']}, pre.${CLASS_OR_ID['AG_HTML_BLOCK']}`
+    const selector = emptyPres.map(key => `pre#${key}`).join(', ')
     const pres = document.querySelectorAll(selector)
     Array.from(pres).forEach(pre => {
       const id = pre.id
diff --git a/src/editor/contentState/history.js b/src/editor/contentState/history.js
index 3b0bcef5..9676a9c9 100644
--- a/src/editor/contentState/history.js
+++ b/src/editor/contentState/history.js
@@ -48,8 +48,13 @@ export class History {
     }
   }
   push (state) {
+    const UNDO_DEPTH = 20
     this.stack.splice(this.index + 1)
     this.stack.push(deepCopy(state))
+    if (this.stack.length > UNDO_DEPTH) {
+      this.stack.shift()
+      this.index = this.index - 1
+    }
     this.index = this.index + 1
   }
 }
diff --git a/src/editor/contentState/index.js b/src/editor/contentState/index.js
index 8e17fe0f..eadd7915 100644
--- a/src/editor/contentState/index.js
+++ b/src/editor/contentState/index.js
@@ -1,3 +1,4 @@
+import { setCursorAtLastLine } from '../codeMirror'
 import { getUniqueId } from '../utils'
 import selection from '../selection'
 import StateRender from '../parser/StateRender'
@@ -42,17 +43,7 @@ const prototypes = [
   importMarkdown
 ]
 
-// deep first search
-const convertBlocksToArray = blocks => {
-  const result = []
-  blocks.forEach(block => {
-    result.push(block)
-    if (block.children.length) {
-      result.push(...convertBlocksToArray(block.children))
-    }
-  })
-  return result
-}
+const HAS_TEXT_BLOCK_REG = /^(h\d|span|th|td|hr|pre)/
 
 // use to cache the keys which you don't want to remove.
 const exemption = new Set()
@@ -91,7 +82,20 @@ class ContentState {
   }
 
   setCursor () {
-    selection.setCursorRange(this.cursor)
+    const { start: { key } } = this.cursor
+    const block = this.getBlock(key)
+    if (block.type !== 'pre') {
+      selection.setCursorRange(this.cursor)
+    } else {
+      const cm = this.codeBlocks.get(key)
+      const { pos } = block
+      if (pos) {
+        cm.focus()
+        cm.setCursor(pos)
+      } else {
+        setCursorAtLastLine(cm)
+      }
+    }
   }
 
   render (isRenderCursor = true) {
@@ -100,12 +104,19 @@ class ContentState {
     matches.forEach((m, i) => {
       m.active = i === index
     })
-    this.stateRender.render(blocks, cursor, activeBlocks, matches)
+    const emptyPres = this.stateRender.render(blocks, cursor, activeBlocks, matches)
+    this.pre2CodeMirror(isRenderCursor, emptyPres)
     if (isRenderCursor) this.setCursor()
-    this.pre2CodeMirror(isRenderCursor)
     this.renderMath()
   }
 
+  partialRender (block) {
+    const { cursor } = this
+    this.stateRender.partialRender(block, cursor)
+    this.setCursor()
+    this.renderMath(block)
+  }
+
   /**
    * A block in Aganippe present a paragraph(block syntax in GFM) or a line in paragraph.
    * a line block must in a `p block` and `p block`'s children must be line blocks.
@@ -137,11 +148,11 @@ class ContentState {
 
   // getBlocks
   getBlocks () {
-    for (const [ key, cm ] of this.codeBlocks.entries()) {
-      const value = cm.getValue()
-      const block = this.getBlock(key)
-      if (block) block.text = value
-    }
+    // for (const [ key, cm ] of this.codeBlocks.entries()) {
+    //   const value = cm.getValue()
+    //   const block = this.getBlock(key)
+    //   if (block) block.text = value
+    // }
     return this.blocks
   }
 
@@ -149,12 +160,22 @@ class ContentState {
     return this.cursor
   }
 
-  getArrayBlocks () {
-    return convertBlocksToArray(this.blocks)
-  }
-
   getBlock (key) {
-    return this.getArrayBlocks().filter(block => block.key === key)[0]
+    let result = null
+    const travel = blocks => {
+      for (const block of blocks) {
+        if (block.key === key) {
+          result = block
+          return
+        }
+        const { children } = block
+        if (children.length) {
+          travel(children)
+        }
+      }
+    }
+    travel(this.blocks)
+    return result
   }
 
   getParent (block) {
@@ -183,15 +204,6 @@ class ContentState {
     return block.nextSibling ? this.getBlock(block.nextSibling) : null
   }
 
-  getFirstBlock () {
-    const arrayBlocks = this.getArrayBlocks()
-    if (arrayBlocks.length) {
-      return arrayBlocks[0]
-    } else {
-      throw new Error('article need at least has one paragraph')
-    }
-  }
-
   /**
    * if target is descendant of parent return true, else return false
    * @param  {[type]}  parent [description]
@@ -459,39 +471,76 @@ class ContentState {
     return null
   }
 
-  getLastBlock () {
-    const arrayBlocks = this.getArrayBlocks()
-    const len = arrayBlocks.length
-    if (len) {
-      return arrayBlocks[len - 1]
-    } else {
-      throw new Error('article need at least has one paragraph')
+  firstInDescendant (block) {
+    const children = block.children
+    if (block.children.length === 0 && HAS_TEXT_BLOCK_REG.test(block.type)) {
+      return block
+    } else if (children.length) {
+      if (children[0].type === 'input' || (children[0].type === 'div' && children[0].editable === false)) { // handle task item
+        return this.firstInDescendant(children[1])
+      } else {
+        return this.firstInDescendant(children[0])
+      }
     }
   }
 
-  wordCount () {
-    const blocks = this.getBlocks()
-    let paragraph = blocks.length
+  lastInDescendant (block) {
+    if (block.children.length === 0 && HAS_TEXT_BLOCK_REG.test(block.type)) {
+      return block
+    } else if (block.children.length) {
+      const children = block.children
+      let lastChild = children[children.length - 1]
+      while (lastChild.editable === false) {
+        lastChild = this.getPreSibling(lastChild)
+      }
+      return this.lastInDescendant(lastChild)
+    }
+  }
+
+  findPreBlockInLocation (block) {
+    const parent = this.getParent(block)
+    const preBlock = this.getPreSibling(block)
+    if (block.preSibling && preBlock.type !== 'input' && preBlock.type !== 'div' && preBlock.editable !== false) { // handle task item and table
+      return this.lastInDescendant(preBlock)
+    } else if (parent) {
+      return this.findPreBlockInLocation(parent)
+    } else {
+      return null
+    }
+  }
+
+  findNextBlockInLocation (block) {
+    const parent = this.getParent(block)
+    const nextBlock = this.getNextSibling(block)
+
+    if (block.nextSibling && nextBlock.editable !== false) {
+      return this.firstInDescendant(nextBlock)
+    } else if (parent) {
+      return this.findNextBlockInLocation(parent)
+    } else {
+      return null
+    }
+  }
+
+  getLastBlock () {
+    const { blocks } = this
+    const len = blocks.length
+    return this.lastInDescendant(blocks[len - 1])
+  }
+
+  wordCount (markdown) {
+    let paragraph = this.blocks.length
     let word = 0
     let character = 0
     let all = 0
 
-    const travel = block => {
-      if (block.text) {
-        const text = block.text
-        const removedChinese = text.replace(/[\u4e00-\u9fa5]/g, '')
-        const tokens = removedChinese.split(/[\s\n]+/).filter(t => t)
-        const chineseWordLength = text.length - removedChinese.length
-        word += chineseWordLength + tokens.length
-        character += tokens.reduce((acc, t) => acc + t.length, 0) + chineseWordLength
-        all += text.length
-      }
-      if (block.children.length) {
-        block.children.forEach(child => travel(child))
-      }
-    }
+    const removedChinese = markdown.replace(/[\u4e00-\u9fa5]/g, '')
+    const tokens = removedChinese.split(/[\s\n]+/).filter(t => t)
+    const chineseWordLength = markdown.length - removedChinese.length
+    word += chineseWordLength + tokens.length
+    character += tokens.reduce((acc, t) => acc + t.length, 0) + chineseWordLength
+    all += markdown.length
 
-    blocks.forEach(block => travel(block))
     return { word, paragraph, character, all }
   }
 
diff --git a/src/editor/contentState/mathCtrl.js b/src/editor/contentState/mathCtrl.js
index fde303b6..19681e41 100644
--- a/src/editor/contentState/mathCtrl.js
+++ b/src/editor/contentState/mathCtrl.js
@@ -4,8 +4,9 @@ import { CLASS_OR_ID } from '../config'
 import 'katex/dist/katex.min.css'
 
 const mathCtrl = ContentState => {
-  ContentState.prototype.renderMath = function () {
-    const mathEles = document.querySelectorAll(`.${CLASS_OR_ID['AG_MATH_RENDER']}`)
+  ContentState.prototype.renderMath = function (block) {
+    const selector = block ? `#${block.key} .${CLASS_OR_ID['AG_MATH_RENDER']}` : `.${CLASS_OR_ID['AG_MATH_RENDER']}`
+    const mathEles = document.querySelectorAll(selector)
     const { loadMathMap } = this
     for (const math of mathEles) {
       const content = math.getAttribute('data-math')
diff --git a/src/editor/contentState/updateCtrl.js b/src/editor/contentState/updateCtrl.js
index 4eda6105..9f52fbaa 100644
--- a/src/editor/contentState/updateCtrl.js
+++ b/src/editor/contentState/updateCtrl.js
@@ -1,8 +1,8 @@
 import selection from '../selection'
 import { tokenizer } from '../parser/parse'
-import { conflict } from '../utils'
+import { conflict, isMetaKey } from '../utils'
 import { getTextContent } from '../utils/domManipulate'
-import { CLASS_OR_ID } from '../config'
+import { CLASS_OR_ID, EVENT_KEYS } from '../config'
 
 const INLINE_UPDATE_FREGMENTS = [
   '^([*+-]\\s)', // Bullet list
@@ -64,8 +64,7 @@ const updateCtrl = ContentState => {
 
     switch (true) {
       case (hr && new Set(hr.split('').filter(i => /\S/.test(i))).size === 1):
-        this.updateHr(block, hr)
-        return true
+        return this.updateHr(block, hr)
 
       case !!bullet:
         this.updateList(block, 'bullet', bullet)
@@ -81,8 +80,7 @@ const updateCtrl = ContentState => {
         return true
 
       case !!header:
-        this.updateHeader(block, header, text)
-        return true
+        return this.updateHeader(block, header, text)
 
       case !!blockquote:
         this.updateBlockQuote(block)
@@ -96,11 +94,15 @@ const updateCtrl = ContentState => {
 
   // thematic break
   ContentState.prototype.updateHr = function (block, marker) {
-    block.type = 'hr'
-    block.text = marker
-    block.children.length = 0
-    const { key } = block
-    this.cursor.start.key = this.cursor.end.key = key
+    if (block.type !== 'hr') {
+      block.type = 'hr'
+      block.text = marker
+      block.children.length = 0
+      const { key } = block
+      this.cursor.start.key = this.cursor.end.key = key
+      return true
+    }
+    return false
   }
 
   ContentState.prototype.updateList = function (block, type, marker = '') {
@@ -230,8 +232,10 @@ const updateCtrl = ContentState => {
       block.type = newType
       block.text = text
       block.children.length = 0
+      this.cursor.start.key = this.cursor.end.key = block.key
+      return true
     }
-    this.cursor.start.key = this.cursor.end.key = block.key
+    return false
   }
 
   ContentState.prototype.updateBlockQuote = function (block) {
@@ -272,12 +276,16 @@ const updateCtrl = ContentState => {
     const { start, end } = selection.getCursorRange()
     const key = start.key
     const block = this.getBlock(key)
+
     // bugfix: #67 problem 1
     if (block && block.icon) return event.preventDefault()
 
+    if (isMetaKey(event)) {
+      return
+    }
     const { start: oldStart, end: oldEnd } = this.cursor
 
-    if (event.type === 'keyup' && (event.key === 'ArrowUp' || event.key === 'ArrowDown') && floatBox.show) {
+    if (event.type === 'keyup' && (event.key === EVENT_KEYS.ArrowUp || event.key === EVENT_KEYS.ArrowDown) && floatBox.show) {
       return
     }
 
@@ -322,7 +330,6 @@ const updateCtrl = ContentState => {
         end.offset !== oldEnd.offset
       ) {
         this.cursor = { start, end }
-        // this.render()
       }
       return
     }
@@ -331,6 +338,7 @@ const updateCtrl = ContentState => {
     const paragraph = document.querySelector(`#${key}`)
     let text = getTextContent(paragraph, [ CLASS_OR_ID['AG_MATH_RENDER'] ])
     let needRender = false
+    let isPartialRender = false
     if (event.type === 'click' && block.type === 'figure' && block.functionType === 'table') {
       // first cell in thead
       const cursorBlock = block.children[1].children[0].children[0].children[0]
@@ -342,6 +350,7 @@ const updateCtrl = ContentState => {
       }
       return this.render()
     }
+
     // remove temp block which generated by operation on code block
     if (block && block.key !== oldKey) {
       let oldBlock = this.getBlock(oldKey)
@@ -362,7 +371,7 @@ const updateCtrl = ContentState => {
     if (block && block.type === 'pre') {
       if (block.key !== oldKey) {
         this.cursor = lastCursor = { start, end }
-        this.render()
+        if (event.type === 'click') this.render()
       }
       return
     }
@@ -405,12 +414,16 @@ const updateCtrl = ContentState => {
       needRender = true
     }
 
+    if (key === oldKey) {
+      isPartialRender = true
+    }
+
     this.cursor = lastCursor = { start, end }
     const checkMarkedUpdate = this.checkNeedRender(block)
     const checkInlineUpdate = this.isCollapse() && this.checkInlineUpdate(block)
 
     if (checkMarkedUpdate || checkInlineUpdate || needRender) {
-      this.render()
+      isPartialRender && !checkInlineUpdate ? this.partialRender(block) : this.render()
     }
   }
 }
diff --git a/src/editor/floatBox/index.css b/src/editor/floatBox/index.css
index 0f7e0ba6..0b0d98f4 100644
--- a/src/editor/floatBox/index.css
+++ b/src/editor/floatBox/index.css
@@ -1,7 +1,7 @@
 .ag-float-box {
   position: absolute;
-  left: -10000px;
-  top: -10000px;
+  left: -1000px;
+  top: -1000px;
   opacity: 0;
   max-height: 168px;
   min-width: 130px;
@@ -12,7 +12,7 @@
   border-radius: 4px;
   box-shadow: 0 2px 12px 0 rgba(0, 0, 0, .1);
   list-style: none;
-  transition: opacity .4s ease-in;
+  transition: opacity .15s ease-in;
   overflow: auto;
   background: #fff;
   z-index: 10000;
diff --git a/src/editor/index.js b/src/editor/index.js
index d5d0a203..cd922c4e 100644
--- a/src/editor/index.js
+++ b/src/editor/index.js
@@ -110,8 +110,8 @@ class Aganippe {
 
   dispatchChange () {
     const { eventCenter } = this
-    const markdown = this.getMarkdown()
-    const wordCount = this.getWordCount()
+    const markdown = this.markdown = this.getMarkdown()
+    const wordCount = this.getWordCount(markdown)
     const cursor = this.getCursor()
     eventCenter.dispatch('change', markdown, wordCount, cursor)
   }
@@ -435,13 +435,12 @@ class Aganippe {
   }
 
   exportUnstylishHtml () {
-    const blocks = this.contentState.getBlocks()
-    const markdown = new ExportMarkdown(blocks).generate()
+    const { markdown } = this
     return exportHtml(markdown)
   }
 
-  getWordCount () {
-    return this.contentState.wordCount()
+  getWordCount (markdown) {
+    return this.contentState.wordCount(markdown)
   }
 
   getCursor () {
diff --git a/src/editor/parser/StateRender.js b/src/editor/parser/StateRender.js
index 8ed1f958..1903b60f 100644
--- a/src/editor/parser/StateRender.js
+++ b/src/editor/parser/StateRender.js
@@ -1,5 +1,5 @@
 import virtualize from 'snabbdom-virtualize/strings'
-import { LOWERCASE_TAGS, CLASS_OR_ID, IMAGE_EXT_REG } from '../config'
+import { CLASS_OR_ID, IMAGE_EXT_REG } from '../config'
 import { conflict, isLengthEven, union, isEven, getIdWithoutSet, loadImage, getImageSrc } from '../utils'
 import { insertAfter, operateClassName } from '../utils/domManipulate'
 import { tokenizer } from './parse'
@@ -19,6 +19,7 @@ class StateRender {
   constructor (eventCenter) {
     this.eventCenter = eventCenter
     this.loadImageMap = new Map()
+    this.tokenCache = new Map()
     this.container = null
   }
 
@@ -52,11 +53,16 @@ class StateRender {
   }
 
   /**
-   * [render]: 2 steps:
-   * render vdom
+   * [render All blocks]
+   * @param  {[Array]} blocks       [description]
+   * @param  {[Object]} cursor       [description]
+   * @param  {[Object]} activeBlocks [description]
+   * @param  {[Array]} matches      [description]
+   * @return {[undefined]}              [description]
    */
   render (blocks, cursor, activeBlocks, matches) {
-    const selector = `${LOWERCASE_TAGS.div}#${CLASS_OR_ID['AG_EDITOR_ID']}`
+    const selector = `div#${CLASS_OR_ID['AG_EDITOR_ID']}`
+    const emptyPres = []
 
     const renderBlock = block => {
       const type = block.type === 'hr' ? 'p' : block.type
@@ -145,7 +151,14 @@ class StateRender {
         const { text } = block
         let children = ''
         if (text) {
-          children = tokenizer(text, highlights).reduce((acc, token) => [...acc, ...this[token.type](h, cursor, block, token)], [])
+          let tokens = null
+          if (highlights.length === 0 && this.tokenCache.has(text)) {
+            tokens = this.tokenCache.get(text)
+          } else {
+            tokens = tokenizer(text, highlights)
+            this.tokenCache.set(text, tokens)
+          }
+          children = tokens.reduce((acc, token) => [...acc, ...this[token.type](h, cursor, block, token)], [])
         }
 
         if (/th|td/.test(block.type)) {
@@ -179,12 +192,6 @@ class StateRender {
           Object.assign(data.dataset, { role: block.type })
         }
 
-        if (block.type === 'pre') {
-          if (block.lang) Object.assign(data.dataset, { lang: block.lang })
-          blockSelector += block.functionType === 'code' ? `.${CLASS_OR_ID['AG_CODE_BLOCK']}` : `.${CLASS_OR_ID['AG_HTML_BLOCK']}`
-          children = ''
-        }
-
         if (block.type === 'input') {
           const { checked, type, key } = block
           Object.assign(data.attrs, { type: 'checkbox' })
@@ -200,6 +207,19 @@ class StateRender {
           blockSelector += `.${CLASS_OR_ID['AG_TEMP']}`
         }
 
+        if (block.type === 'pre') {
+          const { key, lang } = block
+          const pre = document.querySelector(`pre#${key}`)
+          if (pre) {
+            operateClassName(pre, isActive ? 'add' : 'remove', CLASS_OR_ID['AG_ACTIVE'])
+            return toVNode(pre)
+          }
+          if (lang) Object.assign(data.dataset, { lang })
+          blockSelector += block.functionType === 'code' ? `.${CLASS_OR_ID['AG_CODE_BLOCK']}` : `.${CLASS_OR_ID['AG_HTML_BLOCK']}`
+          children = ''
+          emptyPres.push(key)
+        }
+
         return h(blockSelector, data, children)
       }
     }
@@ -213,6 +233,48 @@ class StateRender {
     const oldVdom = toVNode(rootDom)
 
     patch(oldVdom, newVdom)
+    return emptyPres
+  }
+
+  partialRender (block, cursor) {
+    const { key, text } = block
+    const type = block.type === 'hr' ? 'p' : block.type
+    let selector = `${type}#${key}`
+    const oldDom = document.querySelector(selector)
+    const oldVdom = toVNode(oldDom)
+
+    selector += `.${CLASS_OR_ID['AG_PARAGRAPH']}.${CLASS_OR_ID['AG_ACTIVE']}`
+    if (type === 'span') {
+      selector += `.${CLASS_OR_ID['AG_LINE']}`
+    }
+
+    const data = {
+      attrs: {},
+      dataset: {}
+    }
+
+    let children = ''
+    if (text) {
+      children = tokenizer(text, []).reduce((acc, token) => [...acc, ...this[token.type](h, cursor, block, token)], [])
+    }
+
+    if (/th|td/.test(type)) {
+      const { align } = block
+      if (align) {
+        Object.assign(data.attrs, { style: `text-align:${align}` })
+      }
+    }
+
+    if (/^h\d$/.test(block.type)) {
+      Object.assign(data.dataset, { head: block.type })
+    }
+
+    if (/^h/.test(block.type)) { // h\d or hr
+      Object.assign(data.dataset, { role: block.type })
+    }
+
+    const newVdom = h(selector, data, children)
+    patch(oldVdom, newVdom)
   }
 
   hr (h, cursor, block, token, outerClass) {
diff --git a/src/editor/utils/importMarkdown.js b/src/editor/utils/importMarkdown.js
index 293f66a2..ee7de32b 100644
--- a/src/editor/utils/importMarkdown.js
+++ b/src/editor/utils/importMarkdown.js
@@ -335,22 +335,27 @@ const importRegister = ContentState => {
 
   ContentState.prototype.importCursor = function (cursor) {
     // set cursor
-    if (cursor) {
-      const blocks = this.getArrayBlocks()
+    const travel = blocks => {
       for (const block of blocks) {
-        const { text, key } = block
+        const { key, text, children } = block
         if (text) {
-          const offset = block.text.indexOf(CURSOR_DNA)
+          const offset = text.indexOf(CURSOR_DNA)
           if (offset > -1) {
-            // remove the CURSOR_DNA in the block text
             block.text = text.substring(0, offset) + text.substring(offset + CURSOR_DNA.length)
             this.cursor = {
               start: { key, offset },
               end: { key, offset }
             }
+            return
           }
         }
+        if (children.length) {
+          travel(children)
+        }
       }
+    }
+    if (cursor) {
+      travel(this.blocks)
     } else {
       const lastBlock = this.getLastBlock()
       const key = lastBlock.key
diff --git a/src/renderer/components/sourceCode.vue b/src/renderer/components/sourceCode.vue
index d680af39..f060a43f 100644
--- a/src/renderer/components/sourceCode.vue
+++ b/src/renderer/components/sourceCode.vue
@@ -43,7 +43,7 @@
 
     created () {
       this.$nextTick(() => {
-        const { markdown = '', theme } = this
+        const { markdown = '', theme, cursor } = this
         const container = this.$refs.sourceCode
         const codeMirrorConfig = {
           value: markdown,
@@ -60,11 +60,16 @@
           }
         }
         if (theme === 'dark') codeMirrorConfig.theme = 'railscasts'
-        this.editor = codeMirror(container, codeMirrorConfig)
+        const editor = this.editor = codeMirror(container, codeMirrorConfig)
         bus.$on('file-loaded', this.setMarkdown)
         bus.$on('dotu-select', this.handleSelectDoutu)
 
         this.listenChange()
+        if (cursor) {
+          editor.setCursor(cursor)
+        } else {
+          setCursorAtLastLine(editor)
+        }
       })
     },
     beforeDestroy () {