diff --git a/Hander/MapRecordRankingHander.cs b/Hander/MapRecordRankingHander.cs
index 5eac80e..e744149 100644
--- a/Hander/MapRecordRankingHander.cs
+++ b/Hander/MapRecordRankingHander.cs
@@ -36,30 +36,31 @@ namespace OnlineUserPool.Hander
                 UpdateVirtualTime = DateTime.Now;
             }
         }
+        
+        private Random rand = new Random();
 
         //根据当前时段计算虚拟总人数
         private int ComputeTop()
         {
-            var rand = new Random();
             var hour = DateTime.Now.Hour;//当前点数
-            int offset = 1;//少：1 中：3 多：10
+            int top = 1;//少：1 中：3 多：10
             if (hour <= 6)
             {
-                offset = rand.Next((int)(0.8 * START), (int)(1.2 * START));
+                top = rand.Next((int)(0.8 * START), (int)(1.2 * START));
             }
             if (hour > 6 && hour <= 18)
             {
-                offset = rand.Next((int)(0.8 * OFFSET), (int)(1.2 * MEDIUM));
+                top = rand.Next((int)(0.8 * OFFSET), (int)(1.2 * MEDIUM));
             }
             if (hour >= 18 && hour <= 22)
             {
-                offset = rand.Next((int)(0.8 * LARGE), (int)(1.2 * LARGE));
+                top = rand.Next((int)(0.8 * LARGE), (int)(1.2 * LARGE));
             }
             if (hour > 22 && hour <= 24)
             {
-                offset = rand.Next((int)(0.8 * SMALL), (int)(1.2 * SMALL));
+                top = rand.Next((int)(0.8 * SMALL), (int)(1.2 * SMALL));
             }
-            return offset;
+            return top;
         }
 
         /// <summary>