diff --git a/guidescreen/GuideScreen/GuideScreen.UI/FormScreen.cs b/guidescreen/GuideScreen/GuideScreen.UI/FormScreen.cs
index f143f8a..541e6d0 100644
--- a/guidescreen/GuideScreen/GuideScreen.UI/FormScreen.cs
+++ b/guidescreen/GuideScreen/GuideScreen.UI/FormScreen.cs
@@ -779,6 +779,12 @@ namespace GuideScreen.UI
                 chartVacuum.SetOption(option);
             }
 
+            //真空度过期
+            if (vacuumIndex > 1000) 
+            {
+                vacuumIndex = 0;
+                chartVacuum.Option.Clear();
+            }
             vacuumIndex++;
             chartVacuum.Option.AddData("vacuumLine", vacuumIndex, -value);
             chartVacuum.Refresh();
@@ -838,10 +844,6 @@ namespace GuideScreen.UI
                 //更新厕位使用情况
                 toilets = plcController.ToiletPositionRecordTotalByToday();
                 ToileUseChartByDay();
-
-                //真空度过期时间
-                vacuumIndex = 0;
-                chartVacuum.Option.Clear();
             }
         }