diff --git a/modules/friend/model_friend.go b/modules/friend/model_friend.go
index 30dec2f7d..f12b1c7cd 100644
--- a/modules/friend/model_friend.go
+++ b/modules/friend/model_friend.go
@@ -9,6 +9,7 @@ import (
 
 	"go.mongodb.org/mongo-driver/bson/primitive"
 	"go.mongodb.org/mongo-driver/mongo"
+	mgooptions "go.mongodb.org/mongo-driver/mongo/options"
 	"go.mongodb.org/mongo-driver/x/bsonx"
 )
 
@@ -22,7 +23,8 @@ func (this *ModelFriend) Init(service core.IService, module core.IModule, comp c
 	err = this.MCompModel.Init(service, module, comp, options)
 	this.moduole = module.(*Friend)
 	this.DB.CreateIndex(core.SqlTable(this.TableName), mongo.IndexModel{
-		Keys: bsonx.Doc{{Key: "uid", Value: bsonx.Int32(1)}},
+		Keys:    bsonx.Doc{{Key: "uid", Value: bsonx.Int32(1)}},
+		Options: mgooptions.Index().SetUnique(true),
 	})
 	this.DB.CreateIndex(core.SqlTable(this.TableName), mongo.IndexModel{
 		Keys: bsonx.Doc{{Key: "assistHeroId", Value: bsonx.Int32(1)}},