diff --git a/model/channel.go b/model/channel.go
index 7e7b42e6..085e3ca4 100644
--- a/model/channel.go
+++ b/model/channel.go
@@ -8,7 +8,7 @@ import (
 type Channel struct {
 	Id                 int     `json:"id"`
 	Type               int     `json:"type" gorm:"default:0"`
-	Key                string  `json:"key" gorm:"not null;index"`
+	Key                string  `json:"key" gorm:"type:varchar(1500);not null;index"`
 	Status             int     `json:"status" gorm:"default:1"`
 	Name               string  `json:"name" gorm:"index"`
 	Weight             *uint   `json:"weight" gorm:"default:0"`