diff --git a/db/model/application.go b/db/model/application.go
index ef39ddf8d..34bd40f12 100644
--- a/db/model/application.go
+++ b/db/model/application.go
@@ -74,7 +74,7 @@ type ConfigGroupItem struct {
 	AppID           string `gorm:"column:app_id" json:"-"`
 	ConfigGroupName string `gorm:"column:config_group_name" json:"-"`
 	ItemKey         string `gorm:"column:item_key" json:"item_key"`
-	ItemValue       string `gorm:"column:item_value" json:"item_value"`
+	ItemValue       string `gorm:"column:item_value;type:longtext" json:"item_value"`
 }
 
 // TableName return tableName "application"
diff --git a/db/mysql/mysql.go b/db/mysql/mysql.go
index 24d48b6ff..8a6485d38 100644
--- a/db/mysql/mysql.go
+++ b/db/mysql/mysql.go
@@ -247,4 +247,7 @@ func (m *Manager) patchTable() {
 	if err := m.db.Exec("alter  table tenant_services_probe modify column cmd longtext;").Error; err != nil {
 		logrus.Errorf("alter table tenant_services_probe error: %s", err.Error())
 	}
+	if err := m.db.Exec("alter  table app_config_group_item modify column item_value longtext;").Error; err != nil {
+		logrus.Errorf("alter table app_config_group_item error: %s", err.Error())
+	}
 }