diff --git a/mongodbreader/src/main/java/com/alibaba/datax/plugin/reader/mongodbreader/MongoDBReader.java b/mongodbreader/src/main/java/com/alibaba/datax/plugin/reader/mongodbreader/MongoDBReader.java
index 4d129a5a..7cafda0e 100644
--- a/mongodbreader/src/main/java/com/alibaba/datax/plugin/reader/mongodbreader/MongoDBReader.java
+++ b/mongodbreader/src/main/java/com/alibaba/datax/plugin/reader/mongodbreader/MongoDBReader.java
@@ -162,6 +162,8 @@ public class MongoDBReader extends Reader {
                         record.addColumn(new LongColumn((Integer) tempCol));
                     }else if (tempCol instanceof Long) {
                         record.addColumn(new LongColumn((Long) tempCol));
+                    }else if (tempCol instanceof Document) {//兼容document数据类型
+                        record.addColumn(new StringColumn(((Document) tempCol).toJson()));
                     } else {
                         if(KeyConstant.isArrayType(column.getString(KeyConstant.COLUMN_TYPE))) {
                             String splitter = column.getString(KeyConstant.COLUMN_SPLITTER);
diff --git a/mongodbwriter/src/main/java/com/alibaba/datax/plugin/writer/mongodbwriter/MongoDBWriter.java b/mongodbwriter/src/main/java/com/alibaba/datax/plugin/writer/mongodbwriter/MongoDBWriter.java
index 76f35a40..98895a3e 100644
--- a/mongodbwriter/src/main/java/com/alibaba/datax/plugin/writer/mongodbwriter/MongoDBWriter.java
+++ b/mongodbwriter/src/main/java/com/alibaba/datax/plugin/writer/mongodbwriter/MongoDBWriter.java
@@ -156,6 +156,9 @@ public class MongoDBWriter extends Writer{
                 for(int i = 0; i < record.getColumnNumber(); i++) {
 
                     String type = columnMeta.getJSONObject(i).getString(KeyConstant.COLUMN_TYPE);
+                    if(type==null) {
+                        type = "string";
+                    }
                     //空记录处理
                     if (Strings.isNullOrEmpty(record.getColumn(i).asString())) {
                         if (KeyConstant.isArrayType(type.toLowerCase())) {