diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index a8ad4fb..7e5992a 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -173,12 +173,14 @@ void MainWindow::on_actionConnectToDev_triggered()
 
 void MainWindow::on_actionStartPoint_triggered()
 {
-
+    _rightWidget->show();
+    _centralWidget->setAnalysisMode(CentralWidget::AnalysisMode::StartPoint);
 }
 
 void MainWindow::on_actionStopPoint_triggered()
 {
-
+    _rightWidget->show();
+    _centralWidget->setAnalysisMode(CentralWidget::AnalysisMode::StopPoint);
 }
 
 void MainWindow::on_actionNumericalLabel_triggered()
@@ -193,3 +195,8 @@ void MainWindow::on_actionPeakSynthesisAnalysis_triggered()
     _rightWidget->show();
     _centralWidget->setAnalysisMode(CentralWidget::AnalysisMode::PeakSynthesisAnalysis);
 }
+
+void MainWindow::on_actionClearAllData_triggered()
+{
+    _centralWidget->clearAllData();
+}
diff --git a/src/mainwindow.h b/src/mainwindow.h
index cd076e3..79bb693 100644
--- a/src/mainwindow.h
+++ b/src/mainwindow.h
@@ -41,6 +41,7 @@ private slots:
     void on_actionStopPoint_triggered();
     void on_actionPeakSynthesisAnalysis_triggered();
 
+    void on_actionClearAllData_triggered();
 private:
     void connections();
     void setActionEnable(const bool);
diff --git a/src/mainwindow.ui b/src/mainwindow.ui
index e806d92..f0260db 100644
--- a/src/mainwindow.ui
+++ b/src/mainwindow.ui
@@ -53,6 +53,7 @@
     <property name="title">
      <string>工具</string>
     </property>
+    <addaction name="actionClearAllData"/>
    </widget>
    <widget class="QMenu" name="menu_6">
     <property name="title">
@@ -98,6 +99,7 @@
    <addaction name="actionStop"/>
    <addaction name="actionRealTimeWidget"/>
    <addaction name="actionReadOnly"/>
+   <addaction name="actionClearAllData"/>
   </widget>
   <action name="actionNew">
    <property name="icon">
@@ -172,6 +174,11 @@
     <string>峰综合分析</string>
    </property>
   </action>
+  <action name="actionClearAllData">
+   <property name="text">
+    <string>清除所有数据</string>
+   </property>
+  </action>
  </widget>
  <resources>
   <include location="images.qrc"/>
diff --git a/src/ui/centralwidget.cpp b/src/ui/centralwidget.cpp
index 8257162..32d5856 100644
--- a/src/ui/centralwidget.cpp
+++ b/src/ui/centralwidget.cpp
@@ -1,5 +1,8 @@
 #include <QHBoxLayout>
 #include <QRandomGenerator>
+#include <cmath>
+#include <limits>
+#include <qcustomplot.h>
 
 #include "centralwidget.h"
 #include "filemanager.h"
@@ -172,9 +175,25 @@ void CentralWidget::slotRecvAnalysisFileName(const QString &fileName)
 
 void CentralWidget::slotAnalysisSettingApply()
 {
-    double x = _line1->point1->coords().x();
+    switch (_nanlysisMode) {
+    case AnalysisMode::NumericalLabel:
+    {
+        double x = _line1->point1->coords().x();
+        drawText(x,"11111");
+        break;
+    }
+    case AnalysisMode::PeakSynthesisAnalysis:
+    {
+        double x1 = _line1->point1->coords().x();
+        double x2 = _line2->point1->coords().x();
 
-    drawText(x,"11111");
+        fillGraph(x1,x2);
+        //
+        break;
+    }
+    default:
+        break;
+    }
 }
 
 void CentralWidget::slotAnalysisSettingConfirm()
@@ -232,8 +251,11 @@ void CentralWidget::contextMenuEvent(QContextMenuEvent *event)
 
 void CentralWidget::setEventHandlerEnable(const bool flag)
 {
+    // 当竖线隐藏时，需要设置不可选择模式。
+    //    _line1->setSelectable(false);
     _eventHandler->setEnable(flag);
     _line1->setVisible(flag);
+
     if(AnalysisMode::NumericalLabel != _nanlysisMode){
         _line2->setVisible(flag);
     }
@@ -260,29 +282,197 @@ void CentralWidget::drawText(const double x, const QString text)
     arrow->setHead(QCPLineEnding::esSpikeArrow);  // 添加箭头
     arrow->setPen(QPen(Qt::red, 2));
 #endif
+
+#if 0
     if (!_graph || !_customPlot) {
-               return;
-           }
-           // 创建标注文字（QCPItemText）
-           QCPItemText *textLabel = new QCPItemText(_customPlot);
-           textLabel->setPositionAlignment(Qt::AlignBottom|Qt::AlignHCenter);  // 对齐方式
-           textLabel->position->setType(QCPItemPosition::ptPlotCoords);        // 使用数据坐标
+        return;
+    }
+    // 创建标注文字（QCPItemText）
+    QCPItemText *textLabel = new QCPItemText(_customPlot);
+    textLabel->setPositionAlignment(Qt::AlignBottom|Qt::AlignHCenter);  // 对齐方式
+    textLabel->position->setType(QCPItemPosition::ptPlotCoords);        // 使用数据坐标
 
-           // 查找最接近 x 的数据点
-           auto it = _graph->data()->findBegin(x);
-           if (it != _graph->data()->end()) {
-               double y = it->value + 0.5;
-               textLabel->position->setCoords(x, y);
-               textLabel->setText(text);
-               textLabel->setFont(QFont("Arial", 10));
-               textLabel->setPen(QPen(Qt::black));  // 文字边框
-               textLabel->setBrush(Qt::white);      // 文字背景
+    // 查找最接近 x 的数据点
+    auto it = _graph->data()->findBegin(x);
+    if (it != _graph->data()->end()) {
+        double y = it->value + 0.5;
+        textLabel->position->setCoords(x, y);
+        textLabel->setText(text);
+        textLabel->setFont(QFont("Arial", 10));
+        textLabel->setPen(QPen(Qt::black));  // 文字边框
+        textLabel->setBrush(Qt::white);      // 文字背景
 
-               // 创建指向点的线段（QCPItemLine）
-               QCPItemLine *arrow = new QCPItemLine(_customPlot);
-               arrow->start->setParentAnchor(textLabel->bottom);  // 线段起点绑定到标注文字底部
-               arrow->end->setCoords(x, it->value);  // 线段终点绑定到数据点
-               arrow->setHead(QCPLineEnding::esSpikeArrow);  // 添加箭头
-               arrow->setPen(QPen(Qt::red, 2));
-           }
+        // 创建指向点的线段（QCPItemLine）
+        QCPItemLine *arrow = new QCPItemLine(_customPlot);
+        arrow->start->setParentAnchor(textLabel->bottom);  // 线段起点绑定到标注文字底部
+        arrow->end->setCoords(x, it->value);  // 线段终点绑定到数据点
+        arrow->setHead(QCPLineEnding::esSpikeArrow);  // 添加箭头
+        arrow->setPen(QPen(Qt::red, 2));
+    }
+#endif
+
+    double y = findClosestY(x);
+    // 创建标注文字（QCPItemText）
+    QCPItemText *textLabel = new QCPItemText(_customPlot);
+    textLabel->setPositionAlignment(Qt::AlignBottom | Qt::AlignHCenter);  // 对齐方式
+    textLabel->position->setType(QCPItemPosition::ptPlotCoords);        // 使用数据坐标
+    textLabel->position->setCoords(x, y + 10);  // 设置文本位置在指定点上方
+
+    textLabel->setText(text);  // 设置文本内容
+    textLabel->setFont(QFont("Arial", 10));
+    textLabel->setPen(QPen(Qt::black));  // 文字边框
+    textLabel->setBrush(Qt::white);      // 文字背景
+
+    // 创建指向点的线段（QCPItemLine）
+    QCPItemLine *arrow = new QCPItemLine(_customPlot);
+    arrow->start->setParentAnchor(textLabel->bottom);  // 线段起点绑定到标注文字底部
+    arrow->end->setCoords(x, y);  // 线段终点设置为指定的点
+    arrow->setHead(QCPLineEnding::esSpikeArrow);  // 添加箭头
+    arrow->setPen(QPen(Qt::red, 2));
+
+    // 重绘图表以显示文本标签和箭头
+    _customPlot->replot();
+}
+
+double CentralWidget::findClosestY(double targetX) {
+    // 获取曲线数据容器
+    QSharedPointer<QCPDataContainer<QCPGraphData>> dataContainer = _graph->data();
+    // 初始化最小差值和对应的 y 值
+    double minDiff = std::numeric_limits<double>::max();
+    double closestY = 0.0;
+
+    // 遍历数据容器
+    for (int i = 0; i < dataContainer->size(); ++i) {
+        double currentX = dataContainer->at(i)->key;
+        double currentY = dataContainer->at(i)->value;
+
+        // 计算当前 x 与目标 x 的差值的绝对值
+        double diff = std::abs(currentX - targetX);
+
+        // 更新最小差值和对应的 y 值
+        if (diff < minDiff) {
+            minDiff = diff;
+            closestY = currentY;
+        }
+    }
+
+    return closestY;
+}
+
+void CentralWidget::fillGraph(const double x1, const double x2)
+{
+   //未寻找x1\x2之间最大值。
+    double y1 = findClosestY(x1);
+    double y2 = findClosestY(x2);
+
+    QVector<double> xVtr,yVtr;
+    xVtr.push_back(x1);
+    xVtr.push_back(x2);
+
+    yVtr.push_back(y1);
+    yVtr.push_back(y2);
+
+    QCPGraph *mainGraph = _customPlot->addGraph();
+    mainGraph->setData(xVtr, yVtr);
+
+    // 样式配置
+    mainGraph->setPen(QPen(Qt::red, 1));
+
+    _graph->setBrush(QBrush(Qt::lightGray));
+    _graph->setChannelFillGraph(mainGraph);
+
+    //    customPlot->graph(0)->setChannelFillGraph(customPlot->graph(1));
+    //    _customPlot->graph(1);
+    _customPlot->replot();
+}
+
+void CentralWidget::clearAllData()
+{
+
+#if 0
+    // 删除不需要的 Item
+    for (auto *item : itemsToRemove) {
+        _customPlot->removeItem(item);
+        delete item;
+    }
+    _customPlot->replot();
+    //
+    if (_customPlot->graphCount() > 0 && _graph)
+    {
+        // 清除第一个图表上的数据
+        _graph->setData(QVector<double>(), QVector<double>());
+    }
+
+    _customPlot->clearItems();  // 清除所有 QCPItem 对象
+    _customPlot->replot();      // 刷新显示
+#endif
+
+#if 0
+    // 从后向前遍历更安全
+    for (int i = _customPlot->itemCount()-1; i >= 0; --i) {
+        QCPItem* item = _customPlot->item(i);
+        if (item != _line1 && item != _line2) {
+            _customPlot->removeItem(item);
+            delete item;
+        }
+    }
+    _customPlot->replot();
+#endif
+#if 1
+    _line1->setVisible(false);
+    _line2->setVisible(false);
+
+
+    if (_customPlot->graphCount() > 0 && _graph)
+    {
+        // 清除第一个图表上的数据
+        _graph->setData(QVector<double>(), QVector<double>());
+    }
+
+    // 保留的元素列表
+    QList<QCPAbstractItem *> itemsToKeep;
+    itemsToKeep  << _line1 << _line2;
+
+    // 遍历所有项并移除不在保留列表中的项
+    //          QCPAbstractItem
+    //          QList<QCPAbstractItem *> allItems = _customPlot->item();
+    for (int i = _customPlot->itemCount() - 1; i >= 0; --i) {
+        QCPAbstractItem *item = _customPlot->item(i);
+        if (!itemsToKeep.contains(item)) {
+            // 从图表中移除项
+            _customPlot->removeItem(item);
+            // 删除项，释放内存
+            //                  delete item;
+        }
+    }
+
+    // 重绘图表以显示更改
+    _customPlot->replot();
+#endif
+
+
+#if 0
+    // 遍历并删除所有图形元素，除了指定的元素
+    for (int i = _customPlot->itemCount() - 1; i >= 0; --i) {
+        QCPAbstractItem *item = _customPlot->item(i);
+        if (item != _line1 && item != _line2) {
+            _customPlot->removeItem(item);
+        }
+    }
+
+    // 遍历并删除所有绘图元素，除了指定的元素
+    for (int i = _customPlot->graphCount() - 1; i >= 0; --i) {
+        QCPGraph *graph = _customPlot->graph(i);
+        if (graph != _graph) {
+            _customPlot->removeGraph(graph);
+        }
+    }
+
+    // 遍历并删除所有文本元素
+    for (int i = _customPlot->textLayoutCount() - 1; i >= 0; --i) {
+        QCPTextElement *textElement = _customPlot->textLayout(i);
+        _customPlot->removeTextLayout(textElement);
+    }
+
+#endif
 }
diff --git a/src/ui/centralwidget.h b/src/ui/centralwidget.h
index f26bd25..a6decc9 100644
--- a/src/ui/centralwidget.h
+++ b/src/ui/centralwidget.h
@@ -24,6 +24,7 @@ public:
     ~CentralWidget();
 
     void setAnalysisMode(const AnalysisMode);
+    void clearAllData();
 signals:
     void sigContextMenuShow(const QPoint);
     void sigSendLineXCoord(const int,const double);
@@ -43,6 +44,9 @@ protected:
 private:
     void setEventHandlerEnable(const bool);
     void drawText(const double,const QString);
+    double findClosestY(double targetX);
+    void fillGraph(const double x1,const double x2);
+    void findPeakPoint();
 private:
     AnalysisMode _nanlysisMode;
     QCustomPlot *_customPlot;