diff --git a/orm/cmd_utils.go b/orm/cmd_utils.go
index 2811ad3a..602d102a 100644
--- a/orm/cmd_utils.go
+++ b/orm/cmd_utils.go
@@ -102,9 +102,10 @@ func getDbCreateSql(al *alias) (sqls []string) {
 			}
 
 			if fi.auto {
-				if al.Driver == DR_Postgres {
+				switch al.Driver {
+				case DR_Sqlite, DR_Postgres:
 					column += T["auto"]
-				} else {
+				default:
 					column += col + " " + T["auto"]
 				}
 			} else if fi.pk {
diff --git a/orm/db_sqlite.go b/orm/db_sqlite.go
index 20a90cde..46588125 100644
--- a/orm/db_sqlite.go
+++ b/orm/db_sqlite.go
@@ -20,7 +20,7 @@ var sqliteOperators = map[string]string{
 }
 
 var sqliteTypes = map[string]string{
-	"auto":            "NOT NULL PRIMARY KEY AUTOINCREMENT",
+	"auto":            "integer NOT NULL PRIMARY KEY AUTOINCREMENT",
 	"pk":              "NOT NULL PRIMARY KEY",
 	"bool":            "bool",
 	"string":          "varchar(%d)",
diff --git a/orm/models.go b/orm/models.go
index 112183c0..98d0aba3 100644
--- a/orm/models.go
+++ b/orm/models.go
@@ -20,7 +20,6 @@ var (
 	supportTag = map[string]int{
 		"-":            1,
 		"null":         1,
-		"blank":        1,
 		"index":        1,
 		"unique":       1,
 		"pk":           1,
diff --git a/orm/models_boot.go b/orm/models_boot.go
index 33afa701..61180914 100644
--- a/orm/models_boot.go
+++ b/orm/models_boot.go
@@ -42,7 +42,7 @@ func registerModel(model interface{}, prefix string) {
 			if fi.name == "Id" {
 				if fi.sf.Tag.Get(defaultStructTagName) == "" {
 					switch fi.addrValue.Elem().Kind() {
-					case reflect.Int, reflect.Int64, reflect.Int32:
+					case reflect.Int, reflect.Int32, reflect.Int64, reflect.Uint, reflect.Uint32, reflect.Uint64:
 						fi.auto = true
 						fi.pk = true
 						info.fields.pk = fi
diff --git a/orm/models_info_f.go b/orm/models_info_f.go
index f3d91474..7316b612 100644
--- a/orm/models_info_f.go
+++ b/orm/models_info_f.go
@@ -93,7 +93,6 @@ type fieldInfo struct {
 	auto                bool
 	pk                  bool
 	null                bool
-	blank               bool
 	index               bool
 	unique              bool
 	initial             StrTo
@@ -248,7 +247,6 @@ checkType:
 	fi.fullName = mi.fullName + "." + sf.Name
 
 	fi.null = attrs["null"]
-	fi.blank = attrs["blank"]
 	fi.index = attrs["index"]
 	fi.auto = attrs["auto"]
 	fi.pk = attrs["pk"]
@@ -257,7 +255,6 @@ checkType:
 	switch fieldType {
 	case RelManyToMany, RelReverseMany, RelReverseOne:
 		fi.null = false
-		fi.blank = false
 		fi.index = false
 		fi.auto = false
 		fi.pk = false
@@ -360,22 +357,20 @@ checkType:
 		if fi.auto {
 
 			switch addrField.Elem().Kind() {
-			case reflect.Int, reflect.Int32, reflect.Int64:
+			case reflect.Int, reflect.Int32, reflect.Int64, reflect.Uint, reflect.Uint32, reflect.Uint64:
 			default:
-				err = fmt.Errorf("auto primary key only support int, int32, int64, but found `%s`", addrField.Elem().Kind())
+				err = fmt.Errorf("auto primary key only support int, int32, int64, uint, uint32, uint64 but found `%s`", addrField.Elem().Kind())
 				goto end
 			}
 
 			fi.pk = true
 		}
 		fi.null = false
-		fi.blank = false
 		fi.index = false
 		fi.unique = false
 	}
 
 	if fi.unique {
-		fi.blank = false
 		fi.index = false
 	}
 
diff --git a/orm/models_test.go b/orm/models_test.go
index 7794ffb0..9aafdf27 100644
--- a/orm/models_test.go
+++ b/orm/models_test.go
@@ -58,6 +58,11 @@ type DataNull struct {
 	Decimal  float64   `orm:"digits(8);decimals(4);null"`
 }
 
+// only for mysql
+type UserBig struct {
+	Id uint64
+}
+
 type User struct {
 	Id         int
 	UserName   string `orm:"size(30);unique"`
diff --git a/orm/orm_test.go b/orm/orm_test.go
index 0346c1be..1eb8764c 100644
--- a/orm/orm_test.go
+++ b/orm/orm_test.go
@@ -196,6 +196,7 @@ func TestSyncDb(t *testing.T) {
 	RegisterModel(new(Post))
 	RegisterModel(new(Tag))
 	RegisterModel(new(Comment))
+	RegisterModel(new(UserBig))
 
 	BootStrap()