diff --git a/src/gausskernel/optimizer/commands/tablecmds.cpp b/src/gausskernel/optimizer/commands/tablecmds.cpp
index 241966692ec46ab23d2037dfd37c26057494b7ef..81a5af61cafc66af1f4f31f635f8ace492f93048 100644
--- a/src/gausskernel/optimizer/commands/tablecmds.cpp
+++ b/src/gausskernel/optimizer/commands/tablecmds.cpp
@@ -610,6 +610,8 @@ static void ResetRelRedisCtidRelOptions(
 static bool WLMRelationCanTruncate(Relation rel);
 static void alter_partition_policy_if_needed(Relation rel, List* defList);
 static OnCommitAction GttOncommitOption(const List *options);
+static void ATCheckDuplicateColumn(AlterTableCmd* cmd, List* tabCmds);
+static void ATCheckNotNullConstr(AlterTableCmd* cmd, AlteredTableInfo* tab);
 
 
 /* get all partitions oid */
@@ -5923,12 +5925,14 @@ static void ATPrepCmd(List** wqueue, Relation rel, AlterTableCmd* cmd, bool recu
             ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode);
             /* No command-specific prep needed */
             pass = AT_PASS_DROP;
+            ATCheckNotNullConstr(cmd, tab);
             break;
         case AT_SetNotNull: /* ALTER COLUMN SET NOT NULL */
             ATSimplePermissions(rel, ATT_TABLE | ATT_FOREIGN_TABLE);
             ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode);
             /* No command-specific prep needed */
             pass = AT_PASS_ADD_CONSTR;
+            ATCheckNotNullConstr(cmd, tab);
             break;
         case AT_SetStatistics: /* ALTER COLUMN SET STATISTICS */
             ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode);
@@ -6020,6 +6024,7 @@ static void ATPrepCmd(List** wqueue, Relation rel, AlterTableCmd* cmd, bool recu
             /* Performs own recursion */
             ATPrepAlterColumnType(wqueue, tab, rel, recurse, recursing, cmd, lockmode);
             pass = AT_PASS_ALTER_TYPE;
+            ATCheckDuplicateColumn(cmd, tab->subcmds[pass]);
             break;
         case AT_AlterColumnGenericOptions:
             ATSimplePermissions(rel, ATT_FOREIGN_TABLE);
@@ -6206,6 +6211,31 @@ static void ATPrepCmd(List** wqueue, Relation rel, AlterTableCmd* cmd, bool recu
     tab->subcmds[pass] = lappend(tab->subcmds[pass], cmd);
 }
 
+/*
+ * ATCheckDuplicateColumn: Check AT if exists duplicate column name
+ */
+static void ATCheckDuplicateColumn(AlterTableCmd* cmd, List* tabCmds)
+{
+    ListCell* tcmd = NULL;
+    foreach (tcmd, tabCmds) {
+        AlterTableCmd* acmd = (AlterTableCmd*)lfirst(tcmd);
+        if (strcmp(acmd->name, cmd->name) == 0) {
+            ereport(ERROR,
+                (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+                    errmsg("cannot alter type of column \"%s\" twice", cmd->name)));
+        }
+    }
+}
+
+/*
+ * ATCheckNotNullConstr: Check AT set/drop not null if exists duplicate column name
+ */
+static void ATCheckNotNullConstr(AlterTableCmd* cmd, AlteredTableInfo* tab)
+{
+    ATCheckDuplicateColumn(cmd, tab->subcmds[AT_PASS_ADD_CONSTR]);
+    ATCheckDuplicateColumn(cmd, tab->subcmds[AT_PASS_DROP]);
+}
+
 /*
  * ATRewriteCatalogs
  *
diff --git a/src/test/regress/expected/alter_table.out b/src/test/regress/expected/alter_table.out
index 4be0a3033a098fe89540c71f4f8b6c8dc038c1a7..31dd4600de971b85ca717a40dbc83d3cf3c5b624 100644
--- a/src/test/regress/expected/alter_table.out
+++ b/src/test/regress/expected/alter_table.out
@@ -865,6 +865,8 @@ ERROR:  null value in column "b" violates not-null constraint
 DETAIL:  Failing row contains (1, null).
 alter table test_modify modify (b constraint ak null);
 insert into test_modify values(1,null);
+alter table test_modify modify (a null, a not null);
+ERROR:  cannot alter type of column "a" twice
 -- try alter view should fail
 create view test_modify_view as select * from test_modify;
 alter table test_modify_view modify (a not null enable);
@@ -2660,6 +2662,8 @@ ALTER TABLE MODIFY_TABLE_A MODIFY (myint1 VARCHAR(13), mychar1 INT);
  b       | character(1)          | 
  mychar4 | character(1)          | 
 
+ALTER TABLE MODIFY_TABLE_A MODIFY (myint1 VARCHAR(13), myint1 INT);
+ERROR:  cannot alter type of column "myint1" twice
 DROP TABLE MODIFY_TABLE_A;
 create table test_alter_type(a int,b text);
 alter table test_alter_type alter column a type regclass;
diff --git a/src/test/regress/input/cstore_alter_table3.source b/src/test/regress/input/cstore_alter_table3.source
index 11b93abc1c8a6aaf2ed812d4fe64748e8f48d7ad..fff613812f1026bacda63977e4413cd1137051fb 100644
--- a/src/test/regress/input/cstore_alter_table3.source
+++ b/src/test/regress/input/cstore_alter_table3.source
@@ -144,6 +144,9 @@ SELECT DISTINCT * FROM alter_addcols_64;
 CREATE TABLE alter_addcols_79(a int, b int) WITH ( ORIENTATION = COLUMN);
 ALTER TABLE alter_addcols_79 ALTER COLUMN b SET DATA TYPE varchar(40) USING 'ldiloveyouhelloworldiloveyouhelloworl', ALTER COLUMN b SET DATA TYPE bigint;
 ALTER TABLE alter_addcols_79 ALTER COLUMN b SET DATA TYPE varchar(40) USING 'ldiloveyouhelloworldiloveyouhelloworl', ALTER COLUMN b SET DATA TYPE varchar(40) USING 'ldiloveyouhelloworldiloveyouhelloworl';
+CREATE TABLE alter_cons (a int, b int) WITH (ORIENTATION = ROW);
+ALTER TABLE alter_cons ALTER a DROP NOT NULL, ALTER a SET NOT NULL;
+DROP TABLE alter_cons;
 
 -- test multiple SET DATA TYPE within one sql clause.
 CREATE TABLE alter_addcols_80(a int, b int, c varchar(10)) WITH ( ORIENTATION = COLUMN);
diff --git a/src/test/regress/output/cstore_alter_table3.source b/src/test/regress/output/cstore_alter_table3.source
index 6251e72b454512e20c5410c60dc4027ec0a056e2..266f7dde1ebe8f164cf1785136bb08fdec1aa026 100644
--- a/src/test/regress/output/cstore_alter_table3.source
+++ b/src/test/regress/output/cstore_alter_table3.source
@@ -283,6 +283,10 @@ ALTER TABLE alter_addcols_79 ALTER COLUMN b SET DATA TYPE varchar(40) USING 'ldi
 ERROR:  cannot alter type of column "b" twice
 ALTER TABLE alter_addcols_79 ALTER COLUMN b SET DATA TYPE varchar(40) USING 'ldiloveyouhelloworldiloveyouhelloworl', ALTER COLUMN b SET DATA TYPE varchar(40) USING 'ldiloveyouhelloworldiloveyouhelloworl';
 ERROR:  cannot alter type of column "b" twice
+CREATE TABLE alter_cons (a int, b int) WITH (ORIENTATION = ROW);
+ALTER TABLE alter_cons ALTER a DROP NOT NULL, ALTER a SET NOT NULL;
+ERROR:  cannot alter type of column "a" twice
+DROP TABLE alter_cons;
 -- test multiple SET DATA TYPE within one sql clause.
 CREATE TABLE alter_addcols_80(a int, b int, c varchar(10)) WITH ( ORIENTATION = COLUMN);
 create table base_alter_addcols(a int, b int, c varchar(10));
diff --git a/src/test/regress/sql/alter_table.sql b/src/test/regress/sql/alter_table.sql
index 0a8a9714754be60a24cdf57f650a51ee0a8fa565..d98b366d3ff47a1d432983ccf98a1a5e618e72d6 100644
--- a/src/test/regress/sql/alter_table.sql
+++ b/src/test/regress/sql/alter_table.sql
@@ -693,6 +693,7 @@ insert into test_modify values(1,1);
 insert into test_modify values(1,null);
 alter table test_modify modify (b constraint ak null);
 insert into test_modify values(1,null);
+alter table test_modify modify (a null, a not null);
 -- try alter view should fail
 create view test_modify_view as select * from test_modify;
 alter table test_modify_view modify (a not null enable);
@@ -1769,6 +1770,7 @@ ALTER TABLE MODIFY_TABLE_A MODIFY (myint1 VARCHAR(12));
 \d MODIFY_TABLE_A
 ALTER TABLE MODIFY_TABLE_A MODIFY (myint1 VARCHAR(13), mychar1 INT);
 \d MODIFY_TABLE_A
+ALTER TABLE MODIFY_TABLE_A MODIFY (myint1 VARCHAR(13), myint1 INT);
 DROP TABLE MODIFY_TABLE_A;
 
 create table test_alter_type(a int,b text);