diff --git a/ShadowsocksX-NG/PreferencesWindowController.swift b/ShadowsocksX-NG/PreferencesWindowController.swift
index 6cff2ce..d15a335 100644
--- a/ShadowsocksX-NG/PreferencesWindowController.swift
+++ b/ShadowsocksX-NG/PreferencesWindowController.swift
@@ -95,6 +95,7 @@ class PreferencesWindowController: NSWindowController
         if editingProfile != nil {
             if !editingProfile.isValid() {
                 // TODO Shake window?
+                shakeWindows()
                 return
             }
         }
@@ -293,4 +294,27 @@ class PreferencesWindowController: NSWindowController
             }
         }
     }
+
+    func shakeWindows(){
+        let numberOfShakes:Int = 8
+        let durationOfShake:Float = 0.5
+        let vigourOfShake:Float = 0.05
+
+        let frame:CGRect = (window?.frame)!
+        let shakeAnimation = CAKeyframeAnimation()
+
+        let shakePath = CGPathCreateMutable()
+        CGPathMoveToPoint(shakePath, nil, NSMinX(frame), NSMinY(frame))
+
+        for _ in 1...numberOfShakes{
+            CGPathAddLineToPoint(shakePath, nil, NSMinX(frame) - frame.size.width * CGFloat(vigourOfShake), NSMinY(frame))
+            CGPathAddLineToPoint(shakePath, nil, NSMinX(frame) + frame.size.width * CGFloat(vigourOfShake), NSMinY(frame))
+        }
+
+        CGPathCloseSubpath(shakePath)
+        shakeAnimation.path = shakePath
+        shakeAnimation.duration = CFTimeInterval(durationOfShake)
+        window?.animations = ["frameOrigin":shakeAnimation]
+        window?.animator().setFrameOrigin(window!.frame.origin)
+    }
 }