diff --git a/lib/addax-rdbms/src/main/java/com/wgzhao/addax/rdbms/writer/CommonRdbmsWriter.java b/lib/addax-rdbms/src/main/java/com/wgzhao/addax/rdbms/writer/CommonRdbmsWriter.java
index 75da4402f..81c8a0d11 100644
--- a/lib/addax-rdbms/src/main/java/com/wgzhao/addax/rdbms/writer/CommonRdbmsWriter.java
+++ b/lib/addax-rdbms/src/main/java/com/wgzhao/addax/rdbms/writer/CommonRdbmsWriter.java
@@ -470,16 +470,6 @@ protected PreparedStatement fillPreparedStatementColumnType(PreparedStatement pr
             java.util.Date utilDate;
             switch (columnSqlType) {
                 case Types.CLOB:
-                    if (dataBaseType.equals(DataBaseType.Oracle) && column.asString().length() >= 4000) {
-                        Clob clob = preparedStatement.getConnection().createClob();
-                        clob.setString(1, column.asString());
-                        preparedStatement.setClob(columnIndex, clob);
-                    }
-                    else {
-                        preparedStatement.setString(columnIndex, column.asString());
-                    }
-                    break;
-
                 case Types.CHAR:
                 case Types.NCHAR:
                 case Types.NCLOB:
diff --git a/plugin/writer/oraclewriter/src/main/java/com/wgzhao/addax/plugin/writer/oraclewriter/OracleWriter.java b/plugin/writer/oraclewriter/src/main/java/com/wgzhao/addax/plugin/writer/oraclewriter/OracleWriter.java
index 1e7f5b2b4..d69828d17 100644
--- a/plugin/writer/oraclewriter/src/main/java/com/wgzhao/addax/plugin/writer/oraclewriter/OracleWriter.java
+++ b/plugin/writer/oraclewriter/src/main/java/com/wgzhao/addax/plugin/writer/oraclewriter/OracleWriter.java
@@ -20,6 +20,7 @@
 package com.wgzhao.addax.plugin.writer.oraclewriter;
 
 import com.wgzhao.addax.common.base.Key;
+import com.wgzhao.addax.common.element.Column;
 import com.wgzhao.addax.common.exception.AddaxException;
 import com.wgzhao.addax.common.plugin.RecordReceiver;
 import com.wgzhao.addax.common.spi.Writer;
@@ -28,6 +29,10 @@
 import com.wgzhao.addax.rdbms.util.DataBaseType;
 import com.wgzhao.addax.rdbms.writer.CommonRdbmsWriter;
 
+import java.sql.Clob;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+import java.sql.Types;
 import java.util.List;
 
 public class OracleWriter
@@ -100,7 +105,21 @@ public static class Task
         public void init()
         {
             this.writerSliceConfig = getPluginJobConf();
-            this.commonRdbmsWriterTask = new CommonRdbmsWriter.Task(DATABASE_TYPE);
+            this.commonRdbmsWriterTask = new CommonRdbmsWriter.Task(DATABASE_TYPE) {
+                @Override
+                protected PreparedStatement fillPreparedStatementColumnType(PreparedStatement preparedStatement, int columnIndex, int columnSqlType, Column column)
+                        throws SQLException
+                {
+                    if (writerSliceConfig.getString(Key.WRITE_MODE, "").startsWith("update") && columnSqlType == Types.CLOB ) {
+                        Clob clob = preparedStatement.getConnection().createClob();
+                        clob.setString(1, column.asString());
+                        preparedStatement.setClob(columnIndex, clob);
+                        return preparedStatement;
+                    }
+
+                    return super.fillPreparedStatementColumnType(preparedStatement, columnIndex, columnSqlType, column);
+                }
+            };
             commonRdbmsWriterTask.init(writerSliceConfig);
         }