diff --git a/src/main/java/com/actiontech/dble/plan/common/item/function/ItemFuncKeyWord.java b/src/main/java/com/actiontech/dble/plan/common/item/function/ItemFuncKeyWord.java
index c32cefc8b..3c1e4bd68 100644
--- a/src/main/java/com/actiontech/dble/plan/common/item/function/ItemFuncKeyWord.java
+++ b/src/main/java/com/actiontech/dble/plan/common/item/function/ItemFuncKeyWord.java
@@ -10,7 +10,6 @@ public final class ItemFuncKeyWord {
     }
 
     public static final String USING = "USING";
-    public static final String FROM = "FROM";
     public static final String ORDER_BY = "ORDER BY";
     public static final String SEPARATOR = "SEPARATOR";
 }
diff --git a/src/main/java/com/actiontech/dble/plan/common/item/function/castfunc/ItemFuncConvCharset.java b/src/main/java/com/actiontech/dble/plan/common/item/function/castfunc/ItemFuncConvCharset.java
index eddbb46b0..21e8093ec 100644
--- a/src/main/java/com/actiontech/dble/plan/common/item/function/castfunc/ItemFuncConvCharset.java
+++ b/src/main/java/com/actiontech/dble/plan/common/item/function/castfunc/ItemFuncConvCharset.java
@@ -11,6 +11,7 @@ import com.actiontech.dble.plan.common.item.Item;
 import com.actiontech.dble.plan.common.item.function.ItemFuncKeyWord;
 import com.actiontech.dble.plan.common.item.function.strfunc.ItemStrFunc;
 import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
 
 import java.io.UnsupportedEncodingException;
@@ -56,7 +57,7 @@ public class ItemFuncConvCharset extends ItemStrFunc {
     public SQLExpr toExpression() {
         SQLMethodInvokeExpr method = new SQLMethodInvokeExpr(funcName());
         method.addParameter(args.get(0).toExpression());
-        method.putAttribute(ItemFuncKeyWord.USING, mysqlCharset);
+        method.setUsing(new SQLIdentifierExpr(mysqlCharset));
         return method;
     }
 
diff --git a/src/main/java/com/actiontech/dble/plan/visitor/MySQLItemVisitor.java b/src/main/java/com/actiontech/dble/plan/visitor/MySQLItemVisitor.java
index cad8af57b..5659813ca 100644
--- a/src/main/java/com/actiontech/dble/plan/visitor/MySQLItemVisitor.java
+++ b/src/main/java/com/actiontech/dble/plan/visitor/MySQLItemVisitor.java
@@ -567,10 +567,11 @@ public class MySQLItemVisitor extends MySqlASTVisitorAdapter {
                         item = ItemCreate.getInstance().createFuncConvert(args.get(0), castType);
                     }
                 } else {
-                    if (attributes == null || attributes.get(ItemFuncKeyWord.USING) == null) {
-                        throw new MySQLOutPutException(ErrorCode.ER_OPTIMIZER, "", "CONVERT(... USING ...) is standard SQL syntax");
+                    SQLExpr using = x.getUsing();
+                    if (using == null || !(using instanceof SQLIdentifierExpr)) {
+                        throw new MySQLOutPutException(ErrorCode.ER_OPTIMIZER, "", "CONVERT(... USING ...) is standard SQL syntax,You should set correct charset");
                     }
-                    item = new ItemFuncConvCharset(args.get(0), (String) attributes.get(ItemFuncKeyWord.USING));
+                    item = new ItemFuncConvCharset(args.get(0), ((SQLIdentifierExpr) using).getSimpleName());
                 }
                 break;
             case "CHAR":
diff --git a/src/test/java/demo/test/Testparser.java b/src/test/java/demo/test/Testparser.java
index d5ef96098..087337340 100644
--- a/src/test/java/demo/test/Testparser.java
+++ b/src/test/java/demo/test/Testparser.java
@@ -307,6 +307,8 @@ public class Testparser {
         //		selectSQl = "SELECT 1 IS NULL,1 IS NOT UNKNOWN,1 IS TRUE, 0 IS FALSE,2 IN (0,3,5,7), 2 >= 2,1 = 0,2 BETWEEN 1 AND 3;";
         //		obj.test(selectSQl);
         //		selectSQl = "select CAST(expr AS datetime(6) ), CAST(expr AS date ), CAST(expr AS time(6) ) from char_columns where id =1  and name = 'x';";
+        selectSQl = "SELECT CHARSET(CHAR(X'65')), CHARSET(CHAR(X'65' USING utf8));";
+        obj.test(selectSQl);
         selectSQl = "select CAST(expr AS  nchar(2) CHARACTER SET utf8),CAST(expr AS  char(2)), CAST(expr AS  char(2) CHARACTER SET utf8 ),CAST(expr AS  char(2) CHARACTER SET latin1 )  from char_columns where id =1  and name = 'x';";
         obj.test(selectSQl);
         selectSQl = "select CAST(expr AS  char(2) CHARACTER SET utf8 ),CAST(expr AS  SIGNED ),CAST(expr AS unSIGNED )  from char_columns where id =1  and name = 'x';";