diff --git a/source/libs/parser/inc/parAst.h b/source/libs/parser/inc/parAst.h
index 43df082bae5ec016240c80382e2717e66789be44..23fe7c2b1906955506e4a45a1553d306b9c771fc 100644
--- a/source/libs/parser/inc/parAst.h
+++ b/source/libs/parser/inc/parAst.h
@@ -209,7 +209,7 @@ SNode* createCreateTopicStmtUseDb(SAstCreateContext* pCxt, bool ignoreExists, ST
 SNode* createCreateTopicStmtUseTable(SAstCreateContext* pCxt, bool ignoreExists, SToken* pTopicName, SNode* pRealTable,
                                      bool withMeta, SNode* pWhere);
 SNode* createDropTopicStmt(SAstCreateContext* pCxt, bool ignoreNotExists, SToken* pTopicName);
-SNode* createDropCGroupStmt(SAstCreateContext* pCxt, bool ignoreNotExists, const SToken* pCGroupId, SToken* pTopicName);
+SNode* createDropCGroupStmt(SAstCreateContext* pCxt, bool ignoreNotExists, SToken* pCGroupId, SToken* pTopicName);
 SNode* createAlterLocalStmt(SAstCreateContext* pCxt, const SToken* pConfig, const SToken* pValue);
 SNode* createDefaultExplainOptions(SAstCreateContext* pCxt);
 SNode* setExplainVerbose(SAstCreateContext* pCxt, SNode* pOptions, const SToken* pVal);
diff --git a/source/libs/parser/src/parAstCreater.c b/source/libs/parser/src/parAstCreater.c
index 8af54e245b52f49af0d23e97f0d46e8cecdfb40c..d79071e5adf8b9928a3d03fcbfaf1af8c1834228 100644
--- a/source/libs/parser/src/parAstCreater.c
+++ b/source/libs/parser/src/parAstCreater.c
@@ -210,6 +210,15 @@ static bool checkTopicName(SAstCreateContext* pCxt, SToken* pTopicName) {
   return true;
 }
 
+static bool checkCGroupName(SAstCreateContext* pCxt, SToken* pCGroup) {
+  trimEscape(pCGroup);
+  if (pCGroup->n >= TSDB_CGROUP_LEN) {
+    pCxt->errCode = generateSyntaxErrMsg(&pCxt->msgBuf, TSDB_CODE_PAR_INVALID_IDENTIFIER_NAME, pCGroup->z);
+    return false;
+  }
+  return true;
+}
+
 static bool checkStreamName(SAstCreateContext* pCxt, SToken* pStreamName) {
   trimEscape(pStreamName);
   if (pStreamName->n >= TSDB_STREAM_NAME_LEN) {
@@ -1746,12 +1755,15 @@ SNode* createDropTopicStmt(SAstCreateContext* pCxt, bool ignoreNotExists, SToken
   return (SNode*)pStmt;
 }
 
-SNode* createDropCGroupStmt(SAstCreateContext* pCxt, bool ignoreNotExists, const SToken* pCGroupId,
+SNode* createDropCGroupStmt(SAstCreateContext* pCxt, bool ignoreNotExists, SToken* pCGroupId,
                             SToken* pTopicName) {
   CHECK_PARSER_STATUS(pCxt);
   if (!checkTopicName(pCxt, pTopicName)) {
     return NULL;
   }
+  if (!checkCGroupName(pCxt, pCGroupId)) {
+    return NULL;
+  }
   SDropCGroupStmt* pStmt = (SDropCGroupStmt*)nodesMakeNode(QUERY_NODE_DROP_CGROUP_STMT);
   CHECK_OUT_OF_MEM(pStmt);
   pStmt->ignoreNotExists = ignoreNotExists;