diff --git a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java
index 2af092a09b..fe12957991 100644
--- a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java
@@ -735,26 +735,26 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter implements Paramet
     }
 
     public boolean visit(SQLNullExpr x) {
-        if (this.parameterized
-            && ParameterizedOutputVisitorUtils.checkParameterize(x)) {
-            SQLObject parent = x.getParent();
-            if (parent instanceof SQLBinaryOpExpr) {
-                SQLBinaryOpExpr binaryOpExpr = (SQLBinaryOpExpr) parent;
-                if (binaryOpExpr.getOperator() == SQLBinaryOperator.IsNot
-                        || binaryOpExpr.getOperator() == SQLBinaryOperator.Is) {
-                    print("NULL");
-                    return false;
-                }
-            }
-
-            print('?');
-            incrementReplaceCunt();
-
-            if(this instanceof ExportParameterVisitor || this.parameters != null){
-                ExportParameterVisitorUtils.exportParameter(this.parameters, x);
-            }
-            return false;
-        }
+//        if (this.parameterized
+//            && ParameterizedOutputVisitorUtils.checkParameterize(x)) {
+//            SQLObject parent = x.getParent();
+//            if (parent instanceof SQLBinaryOpExpr) {
+//                SQLBinaryOpExpr binaryOpExpr = (SQLBinaryOpExpr) parent;
+//                if (binaryOpExpr.getOperator() == SQLBinaryOperator.IsNot
+//                        || binaryOpExpr.getOperator() == SQLBinaryOperator.Is) {
+//                    print("NULL");
+//                    return false;
+//                }
+//            }
+//
+//            print('?');
+//            incrementReplaceCunt();
+//
+//            if(this instanceof ExportParameterVisitor || this.parameters != null){
+//                ExportParameterVisitorUtils.exportParameter(this.parameters, x);
+//            }
+//            return false;
+//        }
 
         print0(ucase ? "NULL" : "null");
         return false;
diff --git a/src/test/java/com/alibaba/druid/bvt/sql/mysql/param/MySqlParameterizedOutputVisitorTest_14.java b/src/test/java/com/alibaba/druid/bvt/sql/mysql/param/MySqlParameterizedOutputVisitorTest_14.java
new file mode 100644
index 0000000000..2eb429d487
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/sql/mysql/param/MySqlParameterizedOutputVisitorTest_14.java
@@ -0,0 +1,25 @@
+package com.alibaba.druid.bvt.sql.mysql.param;
+
+import com.alibaba.druid.sql.visitor.ParameterizedOutputVisitorUtils;
+import com.alibaba.druid.util.JdbcConstants;
+import junit.framework.TestCase;
+
+/**
+ * Created by wenshao on 16/8/23.
+ */
+public class MySqlParameterizedOutputVisitorTest_14 extends TestCase {
+    public void test_for_parameterize() throws Exception {
+        final String dbType = JdbcConstants.MYSQL;
+
+        String sql = "insert into\n" +
+                "\t\tt_temp (processId,resultId,gmt_create,gmt_modified,result_content,result_number)\n" +
+                "\t\tvalues\n" +
+                "\t\t  \n" +
+                "\t\t\t('4254cc14-1c83-4eaf-95ae-59438dd0cc17', '5fd20fa9-7659-4f8b-a4c2-2021a48317d8', now(),now(),null,null)";
+        String psql = ParameterizedOutputVisitorUtils.parameterize(sql, dbType);
+        assertEquals("INSERT INTO t_temp (processId, resultId, gmt_create, gmt_modified, result_content\n" +
+                "\t, result_number)\n" +
+                "VALUES (?, ?, now(), now(), NULL\n" +
+                "\t\t, NULL)", psql);
+    }
+}