diff --git a/polardbx-server/src/main/java/com/alibaba/polardbx/server/handler/privileges/polar/PolarSetPasswordHandler.java b/polardbx-server/src/main/java/com/alibaba/polardbx/server/handler/privileges/polar/PolarSetPasswordHandler.java
index 17910cd89..308a41bf5 100644
--- a/polardbx-server/src/main/java/com/alibaba/polardbx/server/handler/privileges/polar/PolarSetPasswordHandler.java
+++ b/polardbx-server/src/main/java/com/alibaba/polardbx/server/handler/privileges/polar/PolarSetPasswordHandler.java
@@ -17,6 +17,8 @@
 package com.alibaba.polardbx.server.handler.privileges.polar;
 
 import com.alibaba.polardbx.CobarServer;
+import com.alibaba.polardbx.druid.sql.ast.SQLExpr;
+import com.alibaba.polardbx.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.polardbx.druid.sql.parser.SQLParserFeature;
 import com.alibaba.polardbx.server.ServerConnection;
 import com.alibaba.polardbx.druid.sql.ast.expr.SQLCharExpr;
@@ -26,8 +28,6 @@
 import com.alibaba.polardbx.druid.sql.dialect.mysql.ast.expr.MySqlUserName;
 import com.alibaba.polardbx.druid.sql.parser.ByteString;
 import com.alibaba.polardbx.common.audit.AuditAction;
-import com.alibaba.polardbx.common.exception.TddlRuntimeException;
-import com.alibaba.polardbx.common.exception.code.ErrorCode;
 import com.alibaba.polardbx.common.privilege.UserPasswdChecker;
 import com.alibaba.polardbx.common.utils.GeneralUtil;
 import com.alibaba.polardbx.common.utils.logger.Logger;
@@ -74,7 +74,13 @@ private static List<PolarAccountInfo> getGrantees(ByteString sql, PolarAccountIn
             SQLSetStatement statement =
                 (SQLSetStatement) FastsqlUtils.parseSql(sql, SQLParserFeature.IgnoreNameQuotes).get(0);
             SQLAssignItem assignItem = statement.getItems().get(0);
-            MySqlUserName userName = (MySqlUserName) assignItem.getTarget();
+            SQLExpr target = assignItem.getTarget();
+            MySqlUserName userName;
+            if (target instanceof MySqlUserName) {
+                userName = (MySqlUserName) target;
+            } else {
+                userName =  MySqlUserName.fromIdentifier((SQLIdentifierExpr) target);
+            }
             String password = "";
 
             if (assignItem.getValue() instanceof SQLCharExpr) {