diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0bdb6f64..cf4b594a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 # developing
 - [fix: refactor Count method](https://github.com/beego/beego/pull/5300)
 - [support db_type in ddl ](https://github.com/beego/beego/pull/5404)
+- [orm: PostgreSQL change auto to bigserial](https://github.com/beego/beego/pull/5415)
 # v2.1.1
 - [httplib: fix unstable unit test which use the httplib.org](https://github.com/beego/beego/pull/5232)
 - [rft: remove adapter package](https://github.com/beego/beego/pull/5239)
diff --git a/client/orm/db_postgres.go b/client/orm/db_postgres.go
index 9a7383b8..e7fa6aea 100644
--- a/client/orm/db_postgres.go
+++ b/client/orm/db_postgres.go
@@ -44,7 +44,7 @@ var postgresOperators = map[string]string{
 
 // postgresql column field types.
 var postgresTypes = map[string]string{
-	"auto":                "serial NOT NULL PRIMARY KEY",
+	"auto":                "bigserial NOT NULL PRIMARY KEY",
 	"pk":                  "NOT NULL PRIMARY KEY",
 	"bool":                "bool",
 	"string":              "varchar(%d)",
diff --git a/client/orm/ddl_test.go b/client/orm/ddl_test.go
index 237664c7..ba4a4bfb 100644
--- a/client/orm/ddl_test.go
+++ b/client/orm/ddl_test.go
@@ -66,10 +66,9 @@ func TestGetDbCreateSQLWithComment(t *testing.T) {
 		testCases = append(testCases, TestCase{name: "model with empty comments for MySQL", model: &ModelWithEmptyComments{}, wantSQL: "-- --------------------------------------------------\n--  Table Structure for `github.com/beego/beego/v2/client/orm.ModelWithEmptyComments`\n-- --------------------------------------------------\nCREATE TABLE IF NOT EXISTS `model_with_empty_comments` (\n    `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,\n    `user_name` varchar(30) NOT NULL DEFAULT ''  UNIQUE,\n    `email` varchar(100) NOT NULL DEFAULT '' ,\n    `password` varchar(100) NOT NULL DEFAULT '' \n) ENGINE=INNODB;", wantErr: nil})
 		testCases = append(testCases, TestCase{name: "model with dpType for MySQL", model: &ModelWithDBTypes{}, wantSQL: "-- --------------------------------------------------\n--  Table Structure for `github.com/beego/beego/v2/client/orm.ModelWithDBTypes`\n-- --------------------------------------------------\nCREATE TABLE IF NOT EXISTS `model_with_d_b_types` (\n    `id` bigserial NOT NULL PRIMARY KEY,\n    `user_name` varchar(30) NOT NULL DEFAULT ''  UNIQUE,\n    `email` varchar(100) NOT NULL DEFAULT '' ,\n    `password` varchar(100) NOT NULL DEFAULT '' \n) ENGINE=INNODB;", wantErr: nil})
 	case DRPostgres:
-		testCases = append(testCases, TestCase{name: "model with comments for Postgres", model: &ModelWithComments{}, wantSQL: "-- --------------------------------------------------\n--  Table Structure for `github.com/beego/beego/v2/client/orm.ModelWithComments`\n-- --------------------------------------------------\nCREATE TABLE IF NOT EXISTS \"model_with_comments\" (\n    \"id\" serial NOT NULL PRIMARY KEY,\n    \"user_name\" varchar(30) NOT NULL DEFAULT ''  UNIQUE,\n    \"email\" varchar(100) NOT NULL DEFAULT '' ,\n    \"password\" varchar(100) NOT NULL DEFAULT '' \n);\nCOMMENT ON COLUMN \"model_with_comments\".\"id\" is 'user id';\nCOMMENT ON COLUMN \"model_with_comments\".\"user_name\" is 'user name';\nCOMMENT ON COLUMN \"model_with_comments\".\"email\" is 'email';\nCOMMENT ON COLUMN \"model_with_comments\".\"password\" is 'password';", wantErr: nil})
-		testCases = append(testCases, TestCase{name: "model without comments for Postgres", model: &ModelWithoutComments{}, wantSQL: "-- --------------------------------------------------\n--  Table Structure for `github.com/beego/beego/v2/client/orm.ModelWithoutComments`\n-- --------------------------------------------------\nCREATE TABLE IF NOT EXISTS \"model_without_comments\" (\n    \"id\" serial NOT NULL PRIMARY KEY,\n    \"user_name\" varchar(30) NOT NULL DEFAULT ''  UNIQUE,\n    \"email\" varchar(100) NOT NULL DEFAULT '' ,\n    \"password\" varchar(100) NOT NULL DEFAULT '' \n);", wantErr: nil})
-		testCases = append(testCases, TestCase{name: "model with empty comments for Postgres", model: &ModelWithEmptyComments{}, wantSQL: "-- --------------------------------------------------\n--  Table Structure for `github.com/beego/beego/v2/client/orm.ModelWithEmptyComments`\n-- --------------------------------------------------\nCREATE TABLE IF NOT EXISTS \"model_with_empty_comments\" (\n    \"id\" serial NOT NULL PRIMARY KEY,\n    \"user_name\" varchar(30) NOT NULL DEFAULT ''  UNIQUE,\n    \"email\" varchar(100) NOT NULL DEFAULT '' ,\n    \"password\" varchar(100) NOT NULL DEFAULT '' \n);", wantErr: nil})
-		testCases = append(testCases, TestCase{name: "model with dpType for Postgres", model: &ModelWithDBTypes{}, wantSQL: "-- --------------------------------------------------\n--  Table Structure for `github.com/beego/beego/v2/client/orm.ModelWithDBTypes`\n-- --------------------------------------------------\nCREATE TABLE IF NOT EXISTS \"model_with_d_b_types\" (\n    \"id\" bigserial NOT NULL PRIMARY KEY,\n    \"user_name\" varchar(30) NOT NULL DEFAULT ''  UNIQUE,\n    \"email\" varchar(100) NOT NULL DEFAULT '' ,\n    \"password\" varchar(100) NOT NULL DEFAULT '' \n);", wantErr: nil})
+		testCases = append(testCases, TestCase{name: "model with comments for Postgres", model: &ModelWithComments{}, wantSQL: "-- --------------------------------------------------\n--  Table Structure for `github.com/beego/beego/v2/client/orm.ModelWithComments`\n-- --------------------------------------------------\nCREATE TABLE IF NOT EXISTS \"model_with_comments\" (\n    \"id\" bigserial NOT NULL PRIMARY KEY,\n    \"user_name\" varchar(30) NOT NULL DEFAULT ''  UNIQUE,\n    \"email\" varchar(100) NOT NULL DEFAULT '' ,\n    \"password\" varchar(100) NOT NULL DEFAULT '' \n);\nCOMMENT ON COLUMN \"model_with_comments\".\"id\" is 'user id';\nCOMMENT ON COLUMN \"model_with_comments\".\"user_name\" is 'user name';\nCOMMENT ON COLUMN \"model_with_comments\".\"email\" is 'email';\nCOMMENT ON COLUMN \"model_with_comments\".\"password\" is 'password';", wantErr: nil})
+		testCases = append(testCases, TestCase{name: "model without comments for Postgres", model: &ModelWithoutComments{}, wantSQL: "-- --------------------------------------------------\n--  Table Structure for `github.com/beego/beego/v2/client/orm.ModelWithoutComments`\n-- --------------------------------------------------\nCREATE TABLE IF NOT EXISTS \"model_without_comments\" (\n    \"id\" bigserial NOT NULL PRIMARY KEY,\n    \"user_name\" varchar(30) NOT NULL DEFAULT ''  UNIQUE,\n    \"email\" varchar(100) NOT NULL DEFAULT '' ,\n    \"password\" varchar(100) NOT NULL DEFAULT '' \n);", wantErr: nil})
+		testCases = append(testCases, TestCase{name: "model with empty comments for Postgres", model: &ModelWithEmptyComments{}, wantSQL: "-- --------------------------------------------------\n--  Table Structure for `github.com/beego/beego/v2/client/orm.ModelWithEmptyComments`\n-- --------------------------------------------------\nCREATE TABLE IF NOT EXISTS \"model_with_empty_comments\" (\n    \"id\" bigserial NOT NULL PRIMARY KEY,\n    \"user_name\" varchar(30) NOT NULL DEFAULT ''  UNIQUE,\n    \"email\" varchar(100) NOT NULL DEFAULT '' ,\n    \"password\" varchar(100) NOT NULL DEFAULT '' \n);", wantErr: nil})
 	case DRSqlite:
 		testCases = append(testCases, TestCase{name: "model with comments for Sqlite", model: &ModelWithComments{}, wantSQL: "-- --------------------------------------------------\n--  Table Structure for `github.com/beego/beego/v2/client/orm.ModelWithComments`\n-- --------------------------------------------------\nCREATE TABLE IF NOT EXISTS `model_with_comments` (\n    `id` integer NOT NULL PRIMARY KEY AUTOINCREMENT,\n    `user_name` varchar(30) NOT NULL DEFAULT ''  UNIQUE,\n    `email` varchar(100) NOT NULL DEFAULT '' ,\n    `password` varchar(100) NOT NULL DEFAULT '' \n);", wantErr: nil})
 		testCases = append(testCases, TestCase{name: "model without comments for Sqlite", model: &ModelWithoutComments{}, wantSQL: "-- --------------------------------------------------\n--  Table Structure for `github.com/beego/beego/v2/client/orm.ModelWithoutComments`\n-- --------------------------------------------------\nCREATE TABLE IF NOT EXISTS `model_without_comments` (\n    `id` integer NOT NULL PRIMARY KEY AUTOINCREMENT,\n    `user_name` varchar(30) NOT NULL DEFAULT ''  UNIQUE,\n    `email` varchar(100) NOT NULL DEFAULT '' ,\n    `password` varchar(100) NOT NULL DEFAULT '' \n);", wantErr: nil})