diff --git a/ShadowsocksX-NG/AppDelegate.swift b/ShadowsocksX-NG/AppDelegate.swift
index 11a6c6b..ad6ea00 100644
--- a/ShadowsocksX-NG/AppDelegate.swift
+++ b/ShadowsocksX-NG/AppDelegate.swift
@@ -81,7 +81,7 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSUserNotificationCenterDele
             if let userInfo = note.userInfo {
                 let urls: [NSURL] = userInfo["urls"] as! [NSURL]
                 
-                let mgr = ServerProfileManager()
+                let mgr = ServerProfileManager.instance
                 var isChanged = false
                 
                 for url in urls {
@@ -191,8 +191,7 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSUserNotificationCenterDele
     
     @IBAction func showQRCodeForCurrentServer(sender: NSMenuItem) {
         var errMsg: String?
-        let mgr = ServerProfileManager()
-        if let profile = mgr.getActiveProfile() {
+        if let profile = ServerProfileManager.instance.getActiveProfile() {
             if profile.isValid() {
                 // Show window
                 if qrcodeWinCtrl != nil{
@@ -275,7 +274,7 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSUserNotificationCenterDele
     
     @IBAction func selectServer(sender: NSMenuItem) {
         let index = sender.tag
-        let spMgr = ServerProfileManager()
+        let spMgr = ServerProfileManager.instance
         let newProfile = spMgr.profiles[index]
         if newProfile.uuid != spMgr.activeProfileId {
             spMgr.setActiveProfiledId(newProfile.uuid)
@@ -345,7 +344,7 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSUserNotificationCenterDele
     }
     
     func updateServersMenu() {
-        let mgr = ServerProfileManager()
+        let mgr = ServerProfileManager.instance
         serversMenuItem.submenu?.removeAllItems()
         let preferencesItem = serversPreferencesMenuItem
         
diff --git a/ShadowsocksX-NG/LaunchAgentUtils.swift b/ShadowsocksX-NG/LaunchAgentUtils.swift
index 1488fe3..65fafca 100644
--- a/ShadowsocksX-NG/LaunchAgentUtils.swift
+++ b/ShadowsocksX-NG/LaunchAgentUtils.swift
@@ -147,7 +147,7 @@ func removeSSLocalConfFile() {
 func SyncSSLocal() {
     var changed: Bool = false
     changed = changed || generateSSLocalLauchAgentPlist()
-    let mgr = ServerProfileManager()
+    let mgr = ServerProfileManager.instance
     if mgr.activeProfileId != nil {
         changed = changed || writeSSLocalConfFile((mgr.getActiveProfile()?.toJsonConfig())!)
         
diff --git a/ShadowsocksX-NG/PreferencesWindowController.swift b/ShadowsocksX-NG/PreferencesWindowController.swift
index b3afebf..45fc92a 100644
--- a/ShadowsocksX-NG/PreferencesWindowController.swift
+++ b/ShadowsocksX-NG/PreferencesWindowController.swift
@@ -36,7 +36,7 @@ class PreferencesWindowController: NSWindowController
 
         // Implement this method to handle any initialization after your window controller's window has been loaded from its nib file.
         defaults = NSUserDefaults.standardUserDefaults()
-        profileMgr = ServerProfileManager()
+        profileMgr = ServerProfileManager.instance
         
         methodTextField.addItemsWithObjectValues([
             "aes-128-cfb",
diff --git a/ShadowsocksX-NG/ServerProfileManager.swift b/ShadowsocksX-NG/ServerProfileManager.swift
index 3b678da..f3be6c8 100644
--- a/ShadowsocksX-NG/ServerProfileManager.swift
+++ b/ShadowsocksX-NG/ServerProfileManager.swift
@@ -10,10 +10,12 @@ import Cocoa
 
 class ServerProfileManager: NSObject {
     
+    static let instance:ServerProfileManager = ServerProfileManager()
+    
     var profiles:[ServerProfile]
     var activeProfileId: String?
     
-    override init() {
+    private override init() {
         profiles = [ServerProfile]()
         
         let defaults = NSUserDefaults.standardUserDefaults()