diff --git a/doriswriter/src/main/java/com/alibaba/datax/plugin/writer/doriswriter/DorisJsonCodec.java b/doriswriter/src/main/java/com/alibaba/datax/plugin/writer/doriswriter/DorisJsonCodec.java
index 664b9d36..2a68d050 100644
--- a/doriswriter/src/main/java/com/alibaba/datax/plugin/writer/doriswriter/DorisJsonCodec.java
+++ b/doriswriter/src/main/java/com/alibaba/datax/plugin/writer/doriswriter/DorisJsonCodec.java
@@ -45,6 +45,6 @@ public class DorisJsonCodec extends DorisCodec {
             rowMap.put(fieldName, this.convertColumn(row.getColumn(idx)));
             ++idx;
         }
-        return JSON.toJSONString(rowMap);
+        return JSON.toJSONString(rowMap, SerializerFeature.WriteMapNullValue);
     }
 }