diff --git a/pkg/common/db/model_struct.go b/pkg/common/db/model_struct.go
index efd0d980e..5ed77ed99 100644
--- a/pkg/common/db/model_struct.go
+++ b/pkg/common/db/model_struct.go
@@ -159,9 +159,9 @@ type User struct {
 //}
 // open_im_sdk.BlackInfo(BlackUserInfo) != imdb.Black (BlockUserID)
 type Black struct {
-	OwnerUserID    string    `gorm:"column:owner_user_id;primaryKey;size:256"`
+	OwnerUserID    string    `gorm:"column:owner_user_id;primary_key;size:64"`
 	CreateTime     time.Time `gorm:"column:create_time"`
-	BlockUserID    string    `gorm:"column:block_user_id;primaryKey;"`
+	BlockUserID    string    `gorm:"column:block_user_id;primary_key;size:64"`
 	AddSource      int32     `gorm:"column:add_source"`
 	OperatorUserID string    `gorm:"column:operator_user_id"`
 	Ex             string    `gorm:"column:ex"`