diff --git a/public/react/src/modules/page/MainContent.js b/public/react/src/modules/page/MainContent.js
index c3d6b1384..c03d49351 100644
--- a/public/react/src/modules/page/MainContent.js
+++ b/public/react/src/modules/page/MainContent.js
@@ -75,7 +75,7 @@ class MainContent extends Component {
 		      			{/* 左侧任务说明等功能的区域 */}
 		      			<LeftViewContainer {...newProps}></LeftViewContainer>
 		      		</div>
-					<div id="can-drag" className="can-drag" style={{display: 'none'}}></div>
+					{showIframeContent && vnc_url && <div id="can-drag" className="can-drag" style={{display: 'none'}}></div>}
 		      		<div className="b-label -layout" style={{left: '687px'}}>
 		      			<div className="resize-helper ">
 		      				<Button variant="fab" aria-label="Swap" mini onClick={this.onResizeButtonClick}>
diff --git a/public/react/src/modules/page/VNCDisplay.js b/public/react/src/modules/page/VNCDisplay.js
index fd52fef07..782f59871 100644
--- a/public/react/src/modules/page/VNCDisplay.js
+++ b/public/react/src/modules/page/VNCDisplay.js
@@ -120,6 +120,9 @@ class VNCDisplay extends Component {
             canvas
          */
         rfb.scaleViewport = readQueryVariable('scale', false);
+        rfb.resizeSession = true
+        window.__rfb == rfb;
+
 	}
 	
   	render() {
@@ -127,7 +130,7 @@ class VNCDisplay extends Component {
 
   		
 	    return (
-	      	<div className="">
+	      	<div className="" style={{height: '100%'}}>
                 <style>{`
                     #top_bar {
                         background-color: #6e84a3;
@@ -148,6 +151,7 @@ class VNCDisplay extends Component {
                         cursor: pointer;
                     }
                     #screen {
+                        height: 100%;
                         flex: 1; /* fill remaining space */
                         overflow: hidden;
                     }