diff --git a/model/task.go b/model/task.go
index 4c64a529..8e2b6d0b 100644
--- a/model/task.go
+++ b/model/task.go
@@ -24,7 +24,7 @@ type Task struct {
 	ID         int64                 `json:"id" gorm:"primary_key;AUTO_INCREMENT"`
 	CreatedAt  int64                 `json:"created_at" gorm:"index"`
 	UpdatedAt  int64                 `json:"updated_at"`
-	TaskID     string                `json:"task_id" gorm:"type:varchar(50);index"`  // 第三方id，不一定有/ song id\ Task id
+	TaskID     string                `json:"task_id" gorm:"type:varchar(191);index"` // 第三方id，不一定有/ song id\ Task id
 	Platform   constant.TaskPlatform `json:"platform" gorm:"type:varchar(30);index"` // 平台
 	UserId     int                   `json:"user_id" gorm:"index"`
 	ChannelId  int                   `json:"channel_id" gorm:"index"`
diff --git a/model/user.go b/model/user.go
index ea0584c5..d3e40fa3 100644
--- a/model/user.go
+++ b/model/user.go
@@ -18,7 +18,7 @@ import (
 // Otherwise, the sensitive information will be saved on local storage in plain text!
 type User struct {
 	Id               int            `json:"id"`
-	Username         string         `json:"username" gorm:"unique;index" validate:"max=12"`
+	Username         string         `json:"username" gorm:"unique;index" validate:"max=20"`
 	Password         string         `json:"password" gorm:"not null;" validate:"min=8,max=20"`
 	OriginalPassword string         `json:"original_password" gorm:"-:all"` // this field is only for Password change verification, don't save it to database!
 	DisplayName      string         `json:"display_name" gorm:"index" validate:"max=20"`