diff --git a/tools/goctl/goctl.go b/tools/goctl/goctl.go
index 304387c7..6cc7869c 100644
--- a/tools/goctl/goctl.go
+++ b/tools/goctl/goctl.go
@@ -690,7 +690,7 @@ var commands = []cli.Command{
 						Flags: []cli.Flag{
 							cli.StringFlag{
 								Name:  "url",
-								Usage: `the data source of database,like "postgres://root:password@127.0.0.1:54332/database?sslmode=disable"`,
+								Usage: `the data source of database,like "postgres://root:password@127.0.0.1:5432/database?sslmode=disable"`,
 							},
 							cli.StringFlag{
 								Name:  "table, t",
diff --git a/tools/goctl/model/sql/model/postgresqlmodel.go b/tools/goctl/model/sql/model/postgresqlmodel.go
index ad20ee49..16d8813f 100644
--- a/tools/goctl/model/sql/model/postgresqlmodel.go
+++ b/tools/goctl/model/sql/model/postgresqlmodel.go
@@ -120,9 +120,15 @@ func (m *PostgreSqlModel) getColumns(schema, table string, in []*PostgreColumn)
 			isNullAble = "NO"
 		}
 
-		extra := "auto_increment"
-		if e.IdentityIncrement.Int32 != 1 {
-			extra = ""
+		extra := ""
+		// when identity is true, the column is auto increment
+		if e.IdentityIncrement.Int32 == 1 {
+			extra = "auto_increment"
+		}
+
+		// when type is serial, it's auto_increment. and the default value is tablename_columnname_seq
+		if strings.Contains(e.ColumnDefault.String, table+"_"+e.Field.String+"_seq") {
+			extra = "auto_increment"
 		}
 
 		if len(index[e.Field.String]) > 0 {