diff --git a/README.md b/README.md
index 0f036dc..f72438d 100644
--- a/README.md
+++ b/README.md
@@ -5,11 +5,9 @@
 Add ```using SheepYhangCN.RandomExtension;``` at the head of your C# file
 
 # References
-```RandomX.Choose<T>(Random inst,value1,value2,value3...)``` => Random selected value<br>
-```RandomX.ChooseInList<T>(Random inst,[value1,value2,value3...])``` => Random selected value<br>
-```RandomX.FiftyFifty(Random inst)``` => true/false<br>
-```RandomX.FiftyFifty<T>(Random inst,value1,value2)``` => 50% chance get value1, 50% chance get value2<br>
-```RandomX.Chance(Random inst,chance in percent)``` => You inserted chance to get true, otherwise get false<br>
-```RandomX.Chance<T>(Random inst,chance in percent,value1,value2,value3...)``` => You inserted chance to get value1, otherwise get a random value in [value2,value3...]<br>
-```RandomX.ChanceInList<T>(Random inst,chance in percent,value1,[value2,value3...])``` => You inserted chance to get value1, otherwise get a random value in [value2,value3...]<br>
-```RandomX.ChancePerItem<T>(Random inst,{[value1,chance],[value2,chance]...})``` => You inserted chances to get values
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+```<RandomInst>.Choose<T>(value1,value2,value3...)``` => Random selected value<br>
+```<RandomInst>.FiftyFifty()``` => true/false<br>
+```<RandomInst>.FiftyFifty<T>(value1,value2)``` => 50% chance get value1, 50% chance get value2<br>
+```<RandomInst>.Chance(chance)``` => You inserted chance to get true, otherwise get false<br>
+```<RandomInst>.Chance<T>(chance,value1,value2,value3...)``` => You inserted chance to get value1, otherwise get a random value in [value2,value3...]<br>
+```<RandomInst>.ChancePerItem<T>({[value1,chance],[value2,chance]...})``` => You inserted chances to get values
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diff --git a/README_sChs.md b/README_sChs.md
index 725149f..6954221 100644
--- a/README_sChs.md
+++ b/README_sChs.md
@@ -2,11 +2,9 @@
 把 ```using SheepYhangCN.RandomExtension;``` 添加到你C#文件的开头
 
 # References
-```RandomX.Choose<T>(Random实例,value1,value2,value3...)``` => 随机选择value<br>
-```RandomX.ChooseInList<T>(Random实例,[value1,value2,value3...])``` => 随机选择value<br>
-```RandomX.FiftyFifty(Random实例)``` => true/false<br>
-```RandomX.FiftyFifty<T>(Random实例,value1,value2)``` => 50%概率返回value1，50%概率返回value2<br>
-```RandomX.Chance(Random实例,百分制概率)``` => 你输入的概率返回true，否则返回false<br>
-```RandomX.Chance<T>(Random实例,百分制概率,value1,value2,value3...)``` => 你输入的概率返回true，否则从[value2,value3...]中随机返回一个<br>
-```RandomX.ChanceInList<T>(Random实例,百分制概率,value1,[value2,value3...])``` => 你输入的概率返回true，否则从[value2,value3...]中随机返回一个<br>
-```RandomX.ChancePerItem<T>(Random实例,{[value1,概率],[value2,概率]...})``` => 从你输入的概率来返回值
\ No newline at end of file
+```<Random实例>.Choose<T>(value1,value2,value3...)``` => 随机选择value<br>
+```<Random实例>.FiftyFifty()``` => true/false<br>
+```<Random实例>.FiftyFifty<T>(value1,value2)``` => 50%概率返回value1，50%概率返回value2<br>
+```<Random实例>.Chance(概率)``` => 你输入的概率返回true，否则返回false<br>
+```<Random实例>.Chance<T>(概率,value1,value2,value3...)``` => 你输入的概率返回value1，否则从[value2,value3...]中随机返回一个<br>
+```<Random实例>.ChancePerItem<T>({[value1,概率],[value2,概率]...})``` => 从你输入的概率来返回值
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diff --git a/README_tChs.md b/README_tChs.md
index 8a3da55..d1fe493 100644
--- a/README_tChs.md
+++ b/README_tChs.md
@@ -2,11 +2,9 @@
 把 ```using SheepYhangCN.RandomExtension;``` 添加到你C#檔案的開頭
 
 # References
-```RandomX.Choose<T>(Random實例,value1,value2,value3...)``` => 隨機選擇value<br>
-```RandomX.ChooseInList<T>(Random實例,[value1,value2,value3...])``` => 隨機選擇value<br>
-```RandomX.FiftyFifty(Random實例)``` => true/false<br>
-```RandomX.FiftyFifty<T>(Random實例,value1,value2)``` => 50%概率返回value1，50%概率返回value2<br>
-```RandomX.Chance(Random實例,百分制概率)``` => 你輸入的概率返回true，否則返回false<br>
-```RandomX.Chance<T>(Random實例,百分制概率,value1,value2,value3...)``` => 你輸入的概率返回true，否則從[value2,value3...]中隨機返回一個<br>
-```RandomX.ChanceInList<T>(Random實例,百分制概率,value1,[value2,value3...])``` => 你輸入的概率返回true，否則從[value2,value3...]中隨機返回一個<br>
-```RandomX.ChancePerItem<T>(Random實例,{[value1,概率],[value2,概率]...})``` => 從你輸入的概率來返回值
\ No newline at end of file
+```<Random實例>.Choose<T>(value1,value2,value3...)``` => 隨機選擇value<br>
+```<Random實例>.FiftyFifty()``` => true/false<br>
+```<Random實例>.FiftyFifty<T>(value1,value2)``` => 50%概率返回value1，50%概率返回value2<br>
+```<Random實例>.Chance(概率)``` => 你輸入的概率返回true，否則返回false<br>
+```<Random實例>.Chance<T>(概率,value1,value2,value3...)``` => 你輸入的概率返回value1，否則從[value2,value3...]中隨機返回一個<br>
+```<Random實例>.ChancePerItem<T>({[value1,概率],[value2,概率]...})``` => 從你輸入的概率來返回值
\ No newline at end of file
diff --git a/RandomExtension.cs b/RandomExtension.cs
index 9f9cf23..fba7dc8 100644
--- a/RandomExtension.cs
+++ b/RandomExtension.cs
@@ -1,43 +1,34 @@
 //By SheepYhangCN
 using System;
 using System.Collections.Generic;
-using System.Linq;
 
 namespace SheepYhangCN.RandomExtension
 {
 	public static class RandomX
 	{
-		public static T Choose<T>(Random random,params T[] values)
+		public static T Choose<T>(this Random random,params T[] values)
 		{
 			return values[random.Next(values.Length)];
 		}
-		public static T ChooseInList<T>(Random random,T[] values)
-		{
-			return values[random.Next(values.Length)];
-		}
-		public static bool FiftyFifty(Random random)
+		public static bool FiftyFifty(this Random random)
 		{
 			return Choose(random,false,true);
 		}
-		public static T FiftyFifty<T>(Random random,T arg1,T arg2)
+		public static T FiftyFifty<T>(this Random random,T arg1,T arg2)
 		{
 			return Choose(random,arg1,arg2);
 		}
-		public static bool Chance(Random random,int chance_percent)
-		{
-			return ChooseInList(random,Enumerable.Range(1,100).ToArray()) >= chance_percent;
-		}
-		public static T Chance<T>(Random random,int chance_percent,T result,params T[] others)
+		public static bool Chance(this Random random,double chance)
 		{
-			return Chance(random,chance_percent) ? result : ChooseInList(random,others);
+			return chance >= random.NextDouble();
 		}
-		public static T ChanceInList<T>(Random random,int chance_percent,T result,T[] others)
+		public static T Chance<T>(this Random random,double chance,T result,params T[] others)
 		{
-			return Chance(random,chance_percent) ? result : ChooseInList(random,others);
+			return Chance(random,chance) ? result : Choose(random,others);
 		}
-		public static T ChancePerItem<T>(Random random,Dictionary<T,int> items)
+		public static T ChancePerItem<T>(this Random random,Dictionary<T,int> items)
 		{
-			var r = ChooseInList(random,Enumerable.Range(1,items.Count).ToArray());
+			var r = random.Next(1,items.Count);
 			var n = 0;
 			var result = default(T);
 			foreach (var a in items)