diff --git a/README.md b/README.md
index 3bfab63..5d30dbe 100644
--- a/README.md
+++ b/README.md
@@ -42,9 +42,9 @@ task clean(type: Delete) {
 * You need to add library dependencies infomation to build.gradle in your module. 
 
 ``` 
- compile 'com.github.anzaizai:EasyRefreshLayout:1.1.4'
+ compile 'com.github.anzaizai:EasyRefreshLayout:1.1.5'
 ```
-* last releases version is 1.1.4 can be use
+* last releases version is 1.1.5 can be use
 
 ## step 3
 
diff --git a/library/src/main/java/com/ajguan/library/EasyRefreshLayout.java b/library/src/main/java/com/ajguan/library/EasyRefreshLayout.java
index 524f00a..95698d1 100644
--- a/library/src/main/java/com/ajguan/library/EasyRefreshLayout.java
+++ b/library/src/main/java/com/ajguan/library/EasyRefreshLayout.java
@@ -39,7 +39,7 @@ public class EasyRefreshLayout extends ViewGroup {
     private static long SHOW_COMPLETED_TIME = 500;
     private static long SCROLL_TO_LOADING_DURATION = 500;
     private static long SHOW_SCROLL_DOWN_DURATION = 300;
-    private static double PUll_RESISTANCE = 2;
+    private  double pull_resistance = 2.0f;
 
     private State state = State.RESET;
 
@@ -395,7 +395,7 @@ private void moveSpinner(float offsetY) {
         float extraOS = nextOffsetTop - totalDragDistance;
         float slingshotDist = totalDragDistance;
         float tensionSlingshotPercent = Math.max(0, Math.min(extraOS, slingshotDist * 2) / slingshotDist);
-        float tensionPercent = (float) (tensionSlingshotPercent - Math.pow(tensionSlingshotPercent / PUll_RESISTANCE, 2));
+        float tensionPercent = (float) (tensionSlingshotPercent - Math.pow(tensionSlingshotPercent / this.pull_resistance, 2));
 
         if (offset > 0) { // 下拉的时候才添加阻力
             offset = (int) (offset * (1f - tensionPercent));
@@ -995,16 +995,16 @@ public void setHideLoadViewAnimatorDuration(long showCompletedTime) {
         SHOW_COMPLETED_TIME = showCompletedTime;
     }
 
-    
-    public static double getPUll_RESISTANCE() {
-        return PUll_RESISTANCE;
+
+    public  double getPullResistance() {
+        return this.pull_resistance;
     }
 
     /**
      * Set the pull-down refresh resistance factor
-     * @param PUll_RESISTANCE resistance factor
+     * @param PullResistance resistance factor
      */
-    public static void setPUll_RESISTANCE(double PUll_RESISTANCE) {
-        EasyRefreshLayout.PUll_RESISTANCE = PUll_RESISTANCE;
+    public  void setPullResistance(double PullResistance) {
+        this.pull_resistance = PullResistance;
     }
 }