diff --git a/mongo/mongo.go b/mongo/mongo.go
index aadc838..f0a8eb2 100644
--- a/mongo/mongo.go
+++ b/mongo/mongo.go
@@ -94,3 +94,10 @@ func Insert(ctx context.Context, documents []interface{}, collection string, opt
 	ids = r.InsertedIDs
 	return
 }
+
+// Count  查询总数 
+func Count(ctx context.Context, filter bson.M, collection string) (count int64, err error) {
+	// 调用驱动的 CountDocuments，在数据库端执行的
+	count, err = db.Collection(collection).CountDocuments(ctx, filter)
+	return
+}
\ No newline at end of file