diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index 256123d62b..0057df7902 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -1839,10 +1839,6 @@ static int32_t translateLength(SFunctionNode* pFunc, char* pErrBuf, int32_t len)
     return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
   }
 
-  if (TSDB_DATA_TYPE_VARBINARY == ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 0))->resType.type) {
-    return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
-  }
-
   pFunc->node.resType = (SDataType){.bytes = tDataTypes[TSDB_DATA_TYPE_BIGINT].bytes, .type = TSDB_DATA_TYPE_BIGINT};
   return TSDB_CODE_SUCCESS;
 }
diff --git a/utils/test/c/varbinary_test.c b/utils/test/c/varbinary_test.c
index e29b94ad1f..1d432ffbba 100644
--- a/utils/test/c/varbinary_test.c
+++ b/utils/test/c/varbinary_test.c
@@ -157,10 +157,6 @@ void varbinary_sql_test() {
   taos_free_result(pRes);
 
   // string function test, not support
-  pRes = taos_query(taos, "select length(c2) from stb");
-  ASSERT(taos_errno(pRes) != 0);
-  taos_free_result(pRes);
-
   pRes = taos_query(taos, "select ltrim(c2) from stb");
   ASSERT(taos_errno(pRes) != 0);
   taos_free_result(pRes);
@@ -190,7 +186,7 @@ void varbinary_sql_test() {
   ASSERT(taos_errno(pRes) != 0);
   taos_free_result(pRes);
 
-  // support first/last/last_row/count/hyperloglog/sample/tail/mode
+  // support first/last/last_row/count/hyperloglog/sample/tail/mode/length
   pRes = taos_query(taos, "select first(c2) from stb");
   ASSERT(taos_errno(pRes) == 0);
   taos_free_result(pRes);
@@ -207,6 +203,10 @@ void varbinary_sql_test() {
   ASSERT(taos_errno(pRes) == 0);
   taos_free_result(pRes);
 
+  pRes = taos_query(taos, "select length(c2) from stb where c2 = '\\x7F8290'");
+  ASSERT(taos_errno(pRes) == 0);
+  taos_free_result(pRes);
+
   pRes = taos_query(taos, "select cast(t2 as varbinary(16)) from stb order by ts");
   while ((row = taos_fetch_row(pRes)) != NULL) {
     int32_t*    length = taos_fetch_lengths(pRes);