diff --git a/src/editor/contentState/arrowCtrl.js b/src/editor/contentState/arrowCtrl.js
index bb631891..9793d040 100644
--- a/src/editor/contentState/arrowCtrl.js
+++ b/src/editor/contentState/arrowCtrl.js
@@ -182,7 +182,6 @@ const arrowCtrl = ContentState => {
         activeBlock.temp = true
         this.insertAfter(activeBlock, anchorBlock)
       }
-
       if (activeBlock) {
         event.preventDefault()
         const offset = 0
@@ -200,7 +199,8 @@ const arrowCtrl = ContentState => {
 
         return this.render()
       }
-    } else if (
+    }
+    if (
       (preBlock && preBlock.type === 'pre' && event.key === EVENT_KEYS.ArrowUp) ||
       (preBlock && preBlock.type === 'pre' && event.key === EVENT_KEYS.ArrowLeft && left === 0)
     ) {
diff --git a/src/editor/contentState/backspaceCtrl.js b/src/editor/contentState/backspaceCtrl.js
index 409a3df8..1e5d5b80 100644
--- a/src/editor/contentState/backspaceCtrl.js
+++ b/src/editor/contentState/backspaceCtrl.js
@@ -76,20 +76,19 @@ const backspaceCtrl = ContentState => {
     const { start, end } = selection.getCursorRange()
     const startBlock = this.getBlock(start.key)
     const endBlock = this.getBlock(end.key)
-    // bugfix: #67 problem 1
+    // fix: #67 problem 1
     if (startBlock.icon) return event.preventDefault()
-    // fixbug: unexpect remove all editor html.
-    if (start.key === end.key && startBlock.type === 'figure' && !startBlock.preSibling) {
+    // fix: unexpect remove all editor html. #67 problem 4
+    if (startBlock.type === 'figure' && !startBlock.preSibling) {
       event.preventDefault()
-      let newBlock
-      if (this.blocks.length === 1) {
-        startBlock.type = 'p'
-        startBlock.text = ''
-        startBlock.children = []
-        newBlock = startBlock
-      } else {
-        this.removeBlock(startBlock)
-        newBlock = this.getNextSibling(startBlock)
+      this.removeBlock(startBlock)
+      if (start.key !== end.key) {
+        this.removeBlocks(startBlock, endBlock)
+      }
+      let newBlock = this.getNextSibling(startBlock)
+      if (!newBlock) {
+        this.blocks = [this.createBlock()]
+        newBlock = this.blocks[0]
       }
       const key = newBlock.key
       const offset = 0
@@ -100,11 +99,11 @@ const backspaceCtrl = ContentState => {
       }
       return this.render()
     }
+
     if (start.key !== end.key) {
       event.preventDefault()
       const key = start.key
       const offset = start.offset
-
       const startRemainText = startBlock.type === 'pre'
         ? startBlock.text.substring(0, start.offset - 1)
         : startBlock.text.substring(0, start.offset)
@@ -171,7 +170,7 @@ const backspaceCtrl = ContentState => {
 
     if (block.type === 'pre') {
       const cm = this.codeBlocks.get(id)
-      // if event.preventDefault(), U can not use backspace in language input.
+      // if event.preventDefault(), you can not use backspace in language input.
       if (isCursorAtBegin(cm) && onlyHaveOneLine(cm)) {
         const anchorBlock = block.functionType === 'html' ? this.getParent(this.getParent(block)) : block
         event.preventDefault()
diff --git a/src/editor/event.js b/src/editor/event.js
index 8ee80396..21b06b60 100644
--- a/src/editor/event.js
+++ b/src/editor/event.js
@@ -1,7 +1,5 @@
 import mousetrap from 'mousetrap'
-import {
-  getUniqueId
-} from './utils'
+import { getUniqueId } from './utils'
 
 class EventCenter {
   constructor () {
@@ -71,10 +69,7 @@ class EventCenter {
   }
   // Determine whether the event has been bind
   checkHasBind (cTarget, cEvent, cListener, cCapture) {
-    let i
-    let len = this.events.length
-    for (i = 0; i < len; i++) {
-      const { target, event, listener, capture } = this.events[i]
+    for (const { target, event, listener, capture } of this.events) {
       if (target === cTarget && event === cEvent && listener === cListener && capture === cCapture) {
         return true
       }