diff --git a/JDRealHeatMap.xcodeproj/project.xcworkspace/xcuserdata/JamesDouble.xcuserdatad/UserInterfaceState.xcuserstate b/JDRealHeatMap.xcodeproj/project.xcworkspace/xcuserdata/JamesDouble.xcuserdatad/UserInterfaceState.xcuserstate
index 6b8bfe6..f08815f 100644
Binary files a/JDRealHeatMap.xcodeproj/project.xcworkspace/xcuserdata/JamesDouble.xcuserdatad/UserInterfaceState.xcuserstate and b/JDRealHeatMap.xcodeproj/project.xcworkspace/xcuserdata/JamesDouble.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/JDRealHeatMap/JDSwiftHeatMap/JDRealHeatMap.swift b/JDRealHeatMap/JDSwiftHeatMap/JDRealHeatMap.swift
index ecc0be8..31adce1 100644
--- a/JDRealHeatMap/JDSwiftHeatMap/JDRealHeatMap.swift
+++ b/JDRealHeatMap/JDSwiftHeatMap/JDRealHeatMap.swift
@@ -29,7 +29,7 @@ public class JDSwiftHeatMap:MKMapView
     var missionController:JDHeatMapMissionController!
     var indicator:UIActivityIndicatorView?
     //
-    var showindicator:Bool = true{
+    public var showindicator:Bool = true{
         didSet{
             if(!showindicator)
             {
@@ -67,6 +67,10 @@ public class JDSwiftHeatMap:MKMapView
     
     public func refresh()
     {
+        if(self.showindicator)
+        {
+            self.indicator?.startAnimating()
+        }
         missionController.ExecuteRefreshMission()
     }
     
@@ -97,14 +101,16 @@ public class JDSwiftHeatMap:MKMapView
         indicator = UIActivityIndicatorView(activityIndicatorStyle: .whiteLarge)
         indicator?.translatesAutoresizingMaskIntoConstraints = false
         self.addSubview(indicator!)
-        let sizeWidth = NSLayoutConstraint(item: indicator!, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 0.0, constant: 100)
-        let sizeHeight = NSLayoutConstraint(item: indicator!, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 0.0, constant: 100)
-        let rightCon = NSLayoutConstraint(item: indicator!, attribute: .trailing, relatedBy: .equal, toItem: self, attribute: .trailing, multiplier: 1.0, constant: 0)
-        let BottomCon = NSLayoutConstraint(item: indicator!, attribute: .bottom, relatedBy: .equal, toItem: self, attribute: .bottom, multiplier: 1.0, constant: 0)
+        let sizeWidth = NSLayoutConstraint(item: indicator!, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 0.0, constant: 60)
+        let sizeHeight = NSLayoutConstraint(item: indicator!, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 0.0, constant: 60)
+        let CenterX = NSLayoutConstraint(item: indicator!, attribute: .centerX, relatedBy: .equal, toItem: self, attribute: .centerX, multiplier: 1.0, constant: 0)
+        let CenterY = NSLayoutConstraint(item: indicator!, attribute: .centerY, relatedBy: .equal, toItem: self, attribute: .centerY, multiplier: 1.0, constant: 0)
+        
+        //let rightCon = NSLayoutConstraint(item: indicator!, attribute: .trailing, relatedBy: .equal, toItem: self, attribute: .trailing, multiplier: 1.0, constant: 0)
+        //let BottomCon = NSLayoutConstraint(item: indicator!, attribute: .bottom, relatedBy: .equal, toItem: self, attribute: .bottom, multiplier: 1.0, constant: 0)
         indicator?.addConstraints([sizeWidth,sizeHeight])
-        self.addConstraints([rightCon,BottomCon])
+        self.addConstraints([CenterX,CenterY])
         self.updateConstraints()
-        indicator?.startAnimating()
     }
 }
 
diff --git a/JDRealHeatMap/ViewController.swift b/JDRealHeatMap/ViewController.swift
index 772e3ff..db9141b 100644
--- a/JDRealHeatMap/ViewController.swift
+++ b/JDRealHeatMap/ViewController.swift
@@ -20,7 +20,7 @@ class ViewController: UIViewController {
         super.viewDidLoad()
         addRandomData()
    
-        map = JDSwiftHeatMap(frame: mapsView.frame, delegate: self, maptype: .FlatDistinct)
+        map = JDSwiftHeatMap(frame: mapsView.frame, delegate: self, maptype: .RadiusDistinct)
         map?.delegate = self
         mapsView.addSubview(map!)
     }
diff --git a/README.md b/README.md
index f0d0ec0..85a7ab8 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,11 @@ You can easily make a highly customized HeatMap.
 ![Alt text](https://raw.githubusercontent.com/jamesdouble/JDSwiftHeatMap/master/Readme_img/jdheatmapDemo.png?token=AJBUU1UA_L_wx5f_E3iRsaUGAh_xg3pCks5Zb1yIwA%3D%3D)
 
 # Installation
+* Cocoapods
 
+```
+	pod 'JDSWiftHeatMap'
+```
 
 
 # Usage
@@ -82,10 +86,22 @@ There are two delegate you need to pay close.
 	```
 	*The default radius in km is 100KM.*
 
+### Notice
+
+More data will cause **large memory using**, should be notice.
+
+## Setting
+
+1. public func setType(type:JDMapType) 
+
+	change the display type, it will refresh automatically.
 	
+2. public func refresh()
+
+	Call this function when data changed.
+	
+3. public var showindicator:Bool
 	 
-	 
-	 
-	 
+	Set the loading indicator showing or not.