diff --git a/types/dwt/index.d.ts b/types/dwt/index.d.ts
index cad6825c27..d72fab058f 100644
--- a/types/dwt/index.d.ts
+++ b/types/dwt/index.d.ts
@@ -21,9 +21,11 @@
 declare namespace Dynamsoft {
     namespace WebTwainEnv {
         function GetWebTwain (cid: string): WebTwain;
-        function RegisterEvent(event: string, fn: () => void): void;
+        function RegisterEvent(event: string, fn: (...args: any[]) => void): void;
         function Load(): void;
+        function Unload(): void;
         let AutoLoad: boolean;
+        let Containers: Container[];
     }
 }
 
@@ -1253,6 +1255,12 @@ declare enum EnumDWT_MouseShape {
 	Zoom = 3
 }
 
+interface Container {
+    ContainerId: string;
+    Width: string | number;
+    Height: string | number;
+}
+
 /**
  * @class
  */