diff --git a/HelloHiAPI.cs b/HelloHiAPI.cs
index c9694c2..05f80e4 100644
--- a/HelloHiAPI.cs
+++ b/HelloHiAPI.cs
@@ -1,7 +1,4 @@
-using Hi.Disp;
-using Hi.HiNcKits;
-using Hi.Licenses;
-using Hi.MongoUtils;
+using Hi.HiNcKits;
 using System;
 
 namespace Sample