diff --git a/source/dnode/mnode/impl/src/mndStb.c b/source/dnode/mnode/impl/src/mndStb.c
index 70fd74afc0a80b327265e17d2cb5f1a8d0069769..8a6bd079a4a61e40812c075dade90c4b65c93f73 100644
--- a/source/dnode/mnode/impl/src/mndStb.c
+++ b/source/dnode/mnode/impl/src/mndStb.c
@@ -1578,9 +1578,11 @@ static int32_t mndAlterStbColumnBytes(SMnode *pMnode, const SStbObj *pOld, SStbO
     return -1;
   }
 
+  col_id_t colId = pOld->pColumns[col].colId;
+
   uint32_t nLen = 0;
   for (int32_t i = 0; i < pOld->numOfColumns; ++i) {
-    nLen += (pOld->pColumns[i].colId == col) ? pField->bytes : pOld->pColumns[i].bytes;
+    nLen += (pOld->pColumns[i].colId == colId) ? pField->bytes : pOld->pColumns[i].bytes;
   }
 
   if (nLen > TSDB_MAX_BYTES_PER_ROW) {
@@ -1588,7 +1590,6 @@ static int32_t mndAlterStbColumnBytes(SMnode *pMnode, const SStbObj *pOld, SStbO
     return -1;
   }
 
-  col_id_t colId = pOld->pColumns[col].colId;
   if (mndCheckColAndTagModifiable(pMnode, pOld->name, pOld->uid, colId) != 0) {
     return -1;
   }
diff --git a/tests/script/tsim/alter/table.sim b/tests/script/tsim/alter/table.sim
index 0cf291523a7b4b6ca2cbf321a797c65656dfd59f..b1f18328270e28da013c862ff58577314494f339 100644
--- a/tests/script/tsim/alter/table.sim
+++ b/tests/script/tsim/alter/table.sim
@@ -671,6 +671,12 @@ sql alter table tb2023 add column v nchar(16379);
 sql_error alter table tb2023 modify column v nchar(16380);
 sql desc tb2023
 
+print =============== modify column for normal table
+sql create table ntb_ts3841(ts timestamp, c0 varchar(64000));
+sql alter table ntb_ts3841 modify column c0 varchar(64001);
+sql create table ntb1_ts3841(ts timestamp, c0 nchar(15000));
+sql alter table ntb1_ts3841 modify column c0 nchar(15001);
+
 print =============== error for super table
 sql create table stb2023(ts timestamp, f int) tags(t1 int);
 sql_error alter table stb2023 add column v varchar(65518);
@@ -685,6 +691,20 @@ sql alter table stb2023 add column v nchar(16379);
 sql_error alter table stb2023 modify column v nchar(16380);
 sql desc stb2023
 
+print =============== modify column/tag for super table
+sql create table stb_ts3841(ts timestamp, c0 varchar(64000)) tags(t1 binary(16380));
+sql alter table stb_ts3841 modify column c0 varchar(64001);
+sql alter table stb_ts3841 modify tag t1 binary(16381);
+sql alter table stb_ts3841 modify tag t1 binary(16382);
+sql_error alter table stb_ts3841 modify tag t1 binary(16383);
+
+sql create table stb1_ts3841(ts timestamp, c0 nchar(15000)) tags(t1 nchar(4093));
+sql alter table stb1_ts3841 modify column c0 nchar(15001);
+sql alter table stb1_ts3841 modify tag t1 nchar(4094);
+sql alter table stb1_ts3841 modify tag t1 nchar(4095);
+sql_error alter table stb1_ts3841 modify tag t1 nchar(4096);
+sql_error alter table stb1_ts3841 modify tag t1 binary(16382);
+
 print ======= over
 sql drop database d1
 sql select * from information_schema.ins_databases