diff --git a/App/ToolsUI/PowerSystem/PowerSystem.cpp b/App/ToolsUI/PowerSystem/PowerSystem.cpp
index 4c66d54..7d81826 100644
--- a/App/ToolsUI/PowerSystem/PowerSystem.cpp
+++ b/App/ToolsUI/PowerSystem/PowerSystem.cpp
@@ -152,6 +152,9 @@ PowerSystem::PowerSystem(QWidget *parent) :
    ScopeMa->setGeometry(0,0,ui->frame_Ma->width(),ui->frame_Ma->height());
 
 
+   averageMa.clear();
+   averageTime.clear();
+
    //设置开车时间
    connect(&timer, &QTimer::timeout,
            this, [=]()
@@ -454,17 +457,19 @@ void PowerSystem::setMa(QVariant Ma)
     }
 
 
-    MaMap.insert(QDateTime::currentMSecsSinceEpoch(),Ma.toDouble());
-
-
     averageMa.append(Ma.toDouble());
+    averageTime.append(QDateTime::currentMSecsSinceEpoch());
 
-
-    while(averageMa.size() > 100)
+    while(averageTime.back() - averageTime.first() > (100 * 1000))
     {
+        averageTime.removeFirst();
         averageMa.removeFirst();
     }
 
+    //qDebug() << "size of time:" << averageTime.size() << averageMa.size() << averageTime.back() << averageTime.first();
+
+
+
 
     ScopeMa->setSerieData(tr("马赫"),Ma);
 
diff --git a/App/ToolsUI/PowerSystem/PowerSystem.h b/App/ToolsUI/PowerSystem/PowerSystem.h
index f89889b..a59a4fa 100644
--- a/App/ToolsUI/PowerSystem/PowerSystem.h
+++ b/App/ToolsUI/PowerSystem/PowerSystem.h
@@ -102,6 +102,7 @@ private:
 
 
     QVector<double> averageMa;
+    QVector<qint64> averageTime;
 
     QMap<quint64,double> MaMap;