diff --git a/.changelog/2652.txt b/.changelog/2652.txt
new file mode 100644
index 0000000000..c7f0528c03
--- /dev/null
+++ b/.changelog/2652.txt
@@ -0,0 +1,3 @@
+```release-note:enhancement
+tencentcloud_postgresql_instance: support change pg password regardless user
+```
diff --git a/tencentcloud/services/postgresql/resource_tc_postgresql_instance.go b/tencentcloud/services/postgresql/resource_tc_postgresql_instance.go
index 5989b42b4d..fa3ba7fd39 100644
--- a/tencentcloud/services/postgresql/resource_tc_postgresql_instance.go
+++ b/tencentcloud/services/postgresql/resource_tc_postgresql_instance.go
@@ -944,7 +944,7 @@ func resourceTencentCloudPostgresqlInstanceUpdate(d *schema.ResourceData, meta i
 	if d.HasChange("root_password") {
 		// to avoid other updating process conflicts with updating password, set the password updating with the last step, there is no way to figure out whether changing password is done
 		outErr = resource.Retry(tccommon.WriteRetryTimeout, func() *resource.RetryError {
-			inErr = postgresqlService.SetPostgresqlInstanceRootPassword(ctx, instanceId, d.Get("root_password").(string))
+			inErr = postgresqlService.SetPostgresqlInstanceRootPassword(ctx, instanceId, d.Get("root_user").(string), d.Get("root_password").(string))
 			if inErr != nil {
 				return tccommon.RetryError(inErr)
 			}
diff --git a/tencentcloud/services/postgresql/resource_tc_postgresql_instance_test.go b/tencentcloud/services/postgresql/resource_tc_postgresql_instance_test.go
index f31c008998..50791f5332 100644
--- a/tencentcloud/services/postgresql/resource_tc_postgresql_instance_test.go
+++ b/tencentcloud/services/postgresql/resource_tc_postgresql_instance_test.go
@@ -676,6 +676,7 @@ resource "tencentcloud_postgresql_instance" "test" {
   vpc_id            = tencentcloud_vpc.vpc.id
   subnet_id         = tencentcloud_subnet.subnet.id
   engine_version    = "13.3"
+  root_username     = "tf-user"
   root_password     = "t1qaA2k1wgvfa3?ZZZ"
   charset           = "LATIN1"
   memory            = 4
@@ -711,7 +712,8 @@ resource "tencentcloud_postgresql_instance" "test" {
   vpc_id            = tencentcloud_vpc.vpc.id
   subnet_id         = tencentcloud_subnet.subnet.id
   engine_version    = "13.3"
-  root_password     = "t1qaA2k1wgvfa3?ZZZ"
+  root_username     = "tf-user"
+  root_password     = "t1qaA2k1wgvfa3?ZZZ3daw"
   charset           = "LATIN1"
   memory            = 8
   cpu               = 4
diff --git a/tencentcloud/services/postgresql/service_tencentcloud_postgresql.go b/tencentcloud/services/postgresql/service_tencentcloud_postgresql.go
index bda6927b55..7fde1882ef 100644
--- a/tencentcloud/services/postgresql/service_tencentcloud_postgresql.go
+++ b/tencentcloud/services/postgresql/service_tencentcloud_postgresql.go
@@ -623,7 +623,7 @@ func (me *PostgresqlService) DeletePostgresqlInstance(ctx context.Context, insta
 	return err
 }
 
-func (me *PostgresqlService) SetPostgresqlInstanceRootPassword(ctx context.Context, instanceId string, password string) (errRet error) {
+func (me *PostgresqlService) SetPostgresqlInstanceRootPassword(ctx context.Context, instanceId string, user string, password string) (errRet error) {
 	logId := tccommon.GetLogId(ctx)
 	request := postgresql.NewResetAccountPasswordRequest()
 	defer func() {
@@ -632,7 +632,7 @@ func (me *PostgresqlService) SetPostgresqlInstanceRootPassword(ctx context.Conte
 		}
 	}()
 	request.DBInstanceId = &instanceId
-	request.UserName = helper.String("root")
+	request.UserName = &user
 	request.Password = &password
 
 	ratelimit.Check(request.GetAction())