diff --git a/experiment_data/sample_data/氮气氧气OTI.xlsx b/experiment_data/sample_data/氮气氧气OTI.xlsx
new file mode 100644
index 0000000..b567dd8
Binary files /dev/null and b/experiment_data/sample_data/氮气氧气OTI.xlsx differ
diff --git a/src/DSCAnalysisTool.pro b/src/DSCAnalysisTool.pro
index b3e9b18..b2e2b18 100644
--- a/src/DSCAnalysisTool.pro
+++ b/src/DSCAnalysisTool.pro
@@ -9,7 +9,7 @@ CONFIG+=precompile_header
 PRECOMPILED_HEADER=stable.h
 
 #
-VERSION = 1.0.3
+VERSION = 1.0.5
 # 设置目标文件名，包含版本号
 TARGET = DSCAnalysisTool_$${VERSION}
 
diff --git a/src/data/pointcalculate.cpp b/src/data/pointcalculate.cpp
index f6de377..c8946ca 100644
--- a/src/data/pointcalculate.cpp
+++ b/src/data/pointcalculate.cpp
@@ -891,5 +891,37 @@ QString PointCalculate::textFormatGlassTranstionWithTime(const float t1, const f
             .arg(QString::number(t2, 'f', 3));
 }
 
+Global::ExperimentData PointCalculate::findOnSetDataByTime(const double x1, const double x2)
+{
+    QVector<Global::ExperimentData> edVtr;
+    for(const Global::ExperimentData &ed : _dataVtr) {
+        if(x1 < ed.runTime && ed.runTime < x2){
+            edVtr.push_back(ed);
+        }else if (ed.runTime > x2){
+            break;
+        }
+    }
 
+    Global::ExperimentData resultEd;
 
+    if(edVtr.empty()){
+        return resultEd;
+    }
+
+    double maxDsc = std::numeric_limits<float>::min();
+    for(Global::ExperimentData& ed:edVtr){
+        if(ed.dsc > maxDsc){
+            maxDsc = ed.dsc;
+        }
+    }
+
+    // 从后往前遍历，找到第一个 dsc 与 standardDsc 相等的 ExperimentData
+    for (auto it = edVtr.rbegin(); it != edVtr.rend(); ++it) {
+        if(std::abs(it->dsc - maxDsc) < Global::OnsetAndEndSetRate * maxDsc){
+            resultEd =  *it; // 找到匹配项，返回该值
+            break;
+        }
+    }
+
+    return resultEd;
+}
diff --git a/src/data/pointcalculate.h b/src/data/pointcalculate.h
index ed4d203..4c40331 100644
--- a/src/data/pointcalculate.h
+++ b/src/data/pointcalculate.h
@@ -44,6 +44,8 @@ double obtainTimeValueBasedOnTemperatureValue(const double sampleTemp);
 ExperimentData findOnSetDataByTemperature(const double x1,const double x2);
 ExperimentData findEndSetDataByTemperature(const double x1,const double x2);
 
+ExperimentData findOnSetDataByTime(const double x1,const double x2);
+
 
 // text format
 QString textFormatPeakPoint(const float enthalpyValue,
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index 61d2db9..8b16c9c 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -644,7 +644,8 @@ void MainWindow::on_actionGlassTransition_triggered()
 
 void MainWindow::on_actionOIT_triggered()
 {
-    QMessageBox::warning(this, "warnning", "on_actionOIT_triggered.");
+    _rightWidget->show();
+    _centralWidget->setAnalysisMode(CentralWidget::AnalysisMode::OIT);
 }
 
 void MainWindow::on_actionSpecificHeatCompMethod_triggered()
diff --git a/src/ui/analysisoperationrecorder.h b/src/ui/analysisoperationrecorder.h
index f894a99..8d67b54 100644
--- a/src/ui/analysisoperationrecorder.h
+++ b/src/ui/analysisoperationrecorder.h
@@ -19,7 +19,8 @@ enum AnalysisMode{
     PeakSynthesisAnalysis,
     GlassTransition,
     OnsetTemperaturePoint,
-    EndsetTemperaturePoint
+    EndsetTemperaturePoint,
+    OIT
 };
 #endif
 
diff --git a/src/ui/centralwidget.cpp b/src/ui/centralwidget.cpp
index 6d3aea7..a7347c8 100644
--- a/src/ui/centralwidget.cpp
+++ b/src/ui/centralwidget.cpp
@@ -204,6 +204,14 @@ void CentralWidget::setAnalysisMode(const AnalysisMode mode)
 {
     _analysisMode = mode;
 
+    if(mode == AnalysisMode::Null){
+        _customPlot->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom | QCP::iSelectPlottables);
+    }else{
+        _customPlot->setInteractions(QCP::iSelectPlottables);
+        setEventHandlerEnable(true);
+    }
+
+#if 0
     switch (mode)
     {
     case AnalysisMode::Null:
@@ -222,6 +230,7 @@ void CentralWidget::setAnalysisMode(const AnalysisMode mode)
     default:
         break;
     }
+#endif
 }
 
 void CentralWidget::slotModeModify(const Global::Mode mode)
@@ -1386,11 +1395,95 @@ void CentralWidget::loadAnalysisData(
 
         break;
     }
+    case AnalysisMode::OIT:{
+        logde<<"oit x1,x2:"<<x1<<","<<x2;
+
+       Global::ExperimentData ed = PointCalculate::findOnSetDataByTime(x1,x2);
+
+//        Global::ExperimentData ed = PointCalculate::findOnSetDataByTemperature(x1,x2);
+
+//        PointCalculate::setRegionPointX(x1,x2);
+
+        Global::ExperimentData startData = PointCalculate::_dataVtr.first();
+
+//        QPair<Global::ExperimentData,Global::ExperimentData>
+//                startEndDataPair =  PointCalculate::calculateStartAndEndData();
+
+        logde<<"start data time:"<<startData.runTime;
+        logde<<"end data time:"<<ed.runTime;
+
+        drawOITLine(startData,ed);
+
+        break;
+    }
     default:
         break;
     }
 }
 
+void CentralWidget::drawOITLine(const Global::ExperimentData startData,const Global::ExperimentData endData)
+{
+#if 0
+    // Draw start vertical line.
+    QVector<double> xVtr,yVtr;
+    xVtr.push_back(startData.runTime);
+    xVtr.push_back(startData.runTime);
+
+    yVtr.push_back(startData.dsc - 10);
+    yVtr.push_back(startData.dsc - 20);
+
+    QCPGraph *startLine = _customPlot->addGraph();
+    startLine->setData(xVtr, yVtr);
+    startLine->setPen(QPen(Qt::red, 1));
+
+    // Draw end vertical line.
+    xVtr.clear();
+    yVtr.clear();
+    xVtr.push_back(endData.runTime);
+    xVtr.push_back(endData.runTime);
+
+    yVtr.push_back(endData.dsc - 10);
+    yVtr.push_back(endData.dsc - 20);
+
+    QCPGraph *endLine = _customPlot->addGraph();
+    endLine->setData(xVtr, yVtr);
+    endLine->setPen(QPen(Qt::red, 1));
+#endif
+
+    // Draw start line.
+    QCPItemLine *startLine = new QCPItemLine(_customPlot);
+    startLine->start->setCoords(startData.runTime,startData.dsc - 10);
+    startLine->end->setCoords(startData.runTime,startData.dsc - 20);
+    startLine->setPen(QPen(Qt::red, 1));
+    // Draw end line.
+    QCPItemLine *endLine = new QCPItemLine(_customPlot);
+    endLine->start->setCoords(endData.runTime,endData.dsc - 10);
+    endLine->end->setCoords(endData.runTime,endData.dsc - 20);
+    endLine->setPen(QPen(Qt::red, 1));
+
+    // Draw total line.
+    QCPItemLine *totalLine = new QCPItemLine(_customPlot);
+    totalLine->start->setCoords(startData.runTime,startData.dsc - 15);
+    totalLine->end->setCoords(endData.runTime,endData.dsc - 15);
+    totalLine->setPen(QPen(Qt::red, 1));
+
+    // Draw title.
+    double textX = (endData.runTime - startData.runTime) / 2 + endData.runTime;
+
+    QCPItemText *textLabel = new QCPItemText(_customPlot);
+    textLabel->setPositionAlignment(Qt::AlignCenter);  // 对齐方式
+    textLabel->position->setType(QCPItemPosition::ptPlotCoords);        // 使用数据坐标
+    textLabel->position->setCoords(textX,startData.dsc - 20);  // 设置文本位置在指定点上方
+
+    textLabel->setText("OIT:123.44");  // 设置文本内容
+    QFont font(QFont("Arial", 10));
+    textLabel->setFont(font);
+    textLabel->setSelectedFont(font);
+    textLabel->setSelectable(true);  // 设置为可选
+
+    _customPlot->replot();
+}
+
 void CentralWidget::clearAllData()
 {
     Global::_mode = Global::Mode::Analysis;
diff --git a/src/ui/centralwidget.h b/src/ui/centralwidget.h
index 9fc213a..b28a604 100644
--- a/src/ui/centralwidget.h
+++ b/src/ui/centralwidget.h
@@ -110,6 +110,7 @@ private:
 
     void loadAnalysisData(const AnalysisMode mode,const double x1,const double x2,const QString objectName);
 
+    void drawOITLine(const Global::ExperimentData startData,const Global::ExperimentData endData);
 private:
     AnalysisOperationRecorder::AnalysisMode _analysisMode;
     LocalCustomPlot *_customPlot;