diff --git a/NEWS.md b/NEWS.md
index c5117230..866a4e51 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -2,6 +2,8 @@ Version 0.11.2 For Dev-C++ 7 Beta
  - fix: button "run all problem cases" not disabled when compiling or debugging
  - enhancement: set font for problem case input/output textedits
  - enhancement: when run problem cases, updates output immediately
+ - fix: current line of the disassembly in the cpu window not correctly setted
+ - enhancement: add "step into one machine instruction" and "step over one machine instruction" in the cpu window
 
 Version 0.11.1 For Dev-C++ 7 Beta
  - enhancement: Problem's test case shouldn't accept rich text inputs
diff --git a/RedPandaIDE/compiler/executablerunner.cpp b/RedPandaIDE/compiler/executablerunner.cpp
index cd91faef..71071f19 100644
--- a/RedPandaIDE/compiler/executablerunner.cpp
+++ b/RedPandaIDE/compiler/executablerunner.cpp
@@ -84,10 +84,11 @@ void ExecutableRunner::run()
             args->startupInfo -> dwFlags &= ~STARTF_USESTDHANDLES;
         }
     });
-    process.connect(&process, &QProcess::errorOccurred,
-                    [&](){
-                        errorOccurred= true;
-                    });
+    process.connect(
+                &process, &QProcess::errorOccurred,
+                [&](){
+        errorOccurred= true;
+    });
 //    if (!redirectInput()) {
 //        process.closeWriteChannel();
 //    }
diff --git a/RedPandaIDE/compiler/ojproblemcasesrunner.cpp b/RedPandaIDE/compiler/ojproblemcasesrunner.cpp
index a2731b8b..65b6aa18 100644
--- a/RedPandaIDE/compiler/ojproblemcasesrunner.cpp
+++ b/RedPandaIDE/compiler/ojproblemcasesrunner.cpp
@@ -47,18 +47,14 @@ void OJProblemCasesRunner::runCase(int index,POJProblemCase problemCase)
     }
     env.insert("PATH",path);
     process.setProcessEnvironment(env);
-    process.setCreateProcessArgumentsModifier([this](QProcess::CreateProcessArguments * args){
-        args->flags |=  CREATE_NEW_CONSOLE;
-        args->startupInfo -> dwFlags |= STARTF_USESHOWWINDOW;
-        args->startupInfo->wShowWindow = SW_HIDE;
-    });
     process.setProcessChannelMode(QProcess::MergedChannels);
-    process.connect(&process, &QProcess::errorOccurred,
-                    [&](){
-                        errorOccurred= true;
-                    });
+    process.connect(
+                &process, &QProcess::errorOccurred,
+                [&](){
+        errorOccurred= true;
+    });
     problemCase->output.clear();
-    process.start(QProcess::ReadWrite|QProcess::Unbuffered);
+    process.start();
     process.waitForStarted(5000);
     if (process.state()==QProcess::Running) {
         process.write(problemCase->input.toUtf8());
@@ -85,10 +81,10 @@ void OJProblemCasesRunner::runCase(int index,POJProblemCase problemCase)
         if (errorOccurred)
             break;
         QList<QByteArray> lines = splitByteArrayToLines(buffer);
-        qDebug()<<"----do buffer----";
-        qDebug()<<readed;
-        qDebug()<<buffer;
-        qDebug()<<lines.count();
+//        qDebug()<<"----do buffer----";
+//        qDebug()<<readed;
+//        qDebug()<<buffer;
+//        qDebug()<<lines.count();
         if (lines.count()>=2) {
             for (int i=0;i<lines.count()-1;i++) {
                 QString line = QString::fromLocal8Bit(lines[i]);
@@ -140,10 +136,10 @@ void OJProblemCasesRunner::run()
     auto action = finally([this]{
         emit terminated();
     });
-    for (int i=0;i<mProblemCases.size();i++) {
+    for (int i=0; i < mProblemCases.size(); i++) {
         if (mStop)
             break;
-        POJProblemCase problemCase =mProblemCases[i];
+        POJProblemCase problemCase = mProblemCases[i];
         runCase(i,problemCase);
     }
 }
diff --git a/RedPandaIDE/editor.cpp b/RedPandaIDE/editor.cpp
index 14a97cf9..72a416ed 100644
--- a/RedPandaIDE/editor.cpp
+++ b/RedPandaIDE/editor.cpp
@@ -1249,7 +1249,7 @@ void Editor::copyAsHTML()
 void Editor::setCaretPosition(int line, int aChar)
 {
     this->uncollapseAroundLine(line);
-    this->setCaretXYCentered(true,BufferCoord{aChar,line});
+    this->setCaretXYCentered(BufferCoord{aChar,line});
 }
 
 void Editor::setCaretPositionAndActivate(int line, int aChar)
@@ -1257,7 +1257,7 @@ void Editor::setCaretPositionAndActivate(int line, int aChar)
     this->uncollapseAroundLine(line);
     if (!this->hasFocus())
         this->activate();
-    this->setCaretXYCentered(true,BufferCoord{aChar,line});
+    this->setCaretXYCentered(BufferCoord{aChar,line});
 }
 
 void Editor::addSyntaxIssues(int line, int startChar, int endChar, CompileIssueType errorType, const QString &hint)
diff --git a/RedPandaIDE/mainwindow.cpp b/RedPandaIDE/mainwindow.cpp
index 7c8093b8..51a5a280 100644
--- a/RedPandaIDE/mainwindow.cpp
+++ b/RedPandaIDE/mainwindow.cpp
@@ -3076,6 +3076,9 @@ void MainWindow::disableDebugActions()
     ui->actionContinue->setEnabled(false);
     ui->cbEvaluate->setEnabled(false);
     ui->cbMemoryAddress->setEnabled(false);
+    if (mCPUDialog) {
+        mCPUDialog->updateButtonStates(false);
+    }
 }
 
 void MainWindow::enableDebugActions()
@@ -3087,6 +3090,9 @@ void MainWindow::enableDebugActions()
     ui->actionContinue->setEnabled(!mDebugger->inferiorRunning());
     ui->cbEvaluate->setEnabled(!mDebugger->inferiorRunning());
     ui->cbMemoryAddress->setEnabled(!mDebugger->inferiorRunning());
+    if (mCPUDialog) {
+        mCPUDialog->updateButtonStates(true);
+    }
 }
 
 void MainWindow::onTodoParseStarted(const QString&)
diff --git a/RedPandaIDE/qsynedit/SynEdit.cpp b/RedPandaIDE/qsynedit/SynEdit.cpp
index 4c2a976d..a7924814 100644
--- a/RedPandaIDE/qsynedit/SynEdit.cpp
+++ b/RedPandaIDE/qsynedit/SynEdit.cpp
@@ -203,10 +203,10 @@ void SynEdit::setCaretY(int value)
 
 void SynEdit::setCaretXY(const BufferCoord &value)
 {
-    setCaretXYCentered(false,value);
+    setCaretXYEx(true,value);
 }
 
-void SynEdit::setCaretXYEx(bool CallEnsureCursorPos, BufferCoord value)
+void SynEdit::setCaretXYEx(bool CallEnsureCursorPosVisible, BufferCoord value)
 {
     bool vTriggerPaint=true; //how to test it?
 
@@ -260,7 +260,7 @@ void SynEdit::setCaretXYEx(bool CallEnsureCursorPos, BufferCoord value)
         // calls could raise an exception, and we don't want fLastCaretX to be
         // left in an undefined state if that happens.
         updateLastCaretX();
-        if (CallEnsureCursorPos)
+        if (CallEnsureCursorPosVisible)
             ensureCursorPosVisible();
         mStateFlags.setFlag(SynStateFlag::sfCaretChanged);
         mStateFlags.setFlag(SynStateFlag::sfScrollbarChanged);
@@ -279,21 +279,20 @@ void SynEdit::setCaretXYEx(bool CallEnsureCursorPos, BufferCoord value)
 
 }
 
-void SynEdit::setCaretXYCentered(bool ForceToMiddle, const BufferCoord &value)
+void SynEdit::setCaretXYCentered(const BufferCoord &value)
 {
     incPaintLock();
     auto action = finally([this] {
         decPaintLock();
     });
     mStatusChanges.setFlag(SynStatusChange::scSelection);
-    setCaretXYEx(ForceToMiddle,value);
+    setCaretXYEx(false,value);
     if (selAvail())
         invalidateSelection();
     mBlockBegin.Char = mCaretX;
     mBlockBegin.Line = mCaretY;
     mBlockEnd = mBlockBegin;
-    if (ForceToMiddle)
-        ensureCursorPosVisibleEx(true); // but here after block has been set
+    ensureCursorPosVisibleEx(true); // but here after block has been set
 }
 
 void SynEdit::uncollapseAroundLine(int line)
diff --git a/RedPandaIDE/qsynedit/SynEdit.h b/RedPandaIDE/qsynedit/SynEdit.h
index 3f7511be..512c6d98 100644
--- a/RedPandaIDE/qsynedit/SynEdit.h
+++ b/RedPandaIDE/qsynedit/SynEdit.h
@@ -213,8 +213,8 @@ public:
     void setCaretX(int value);
     void setCaretY(int value);
     void setCaretXY(const BufferCoord& value);
-    void setCaretXYEx(bool CallEnsureCursorPos, BufferCoord value);
-    void setCaretXYCentered(bool ForceToMiddle, const BufferCoord& value);
+    void setCaretXYEx(bool CallEnsureCursorPosVisible, BufferCoord value);
+    void setCaretXYCentered(const BufferCoord& value);
     void setCaretAndSelection(const BufferCoord& ptCaret,
                               const BufferCoord& ptBefore,
                               const BufferCoord& ptAfter);
diff --git a/RedPandaIDE/widgets/cpudialog.cpp b/RedPandaIDE/widgets/cpudialog.cpp
index 8494e430..66769b2f 100644
--- a/RedPandaIDE/widgets/cpudialog.cpp
+++ b/RedPandaIDE/widgets/cpudialog.cpp
@@ -65,6 +65,12 @@ void CPUDialog::updateInfo()
     }
 }
 
+void CPUDialog::updateButtonStates(bool enable)
+{
+    ui->btnStepIntoInstruction->setEnabled(enable);
+    ui->btnStepOverInstruction->setEnabled(enable);
+}
+
 void CPUDialog::setDisassembly(const QString& file, const QString& funcName,const QStringList& lines)
 {
     ui->txtFunctionName->setText(QString("%1:%2").arg(file, funcName));
@@ -78,7 +84,7 @@ void CPUDialog::setDisassembly(const QString& file, const QString& funcName,cons
         ui->txtCode->lines()->add(line);
     }
     if (activeLine!=-1)
-        ui->txtCode->setCaretXYCentered(true,BufferCoord{1,activeLine});
+        ui->txtCode->setCaretXYEx(true,BufferCoord{1,activeLine+1});
 }
 
 void CPUDialog::sendSyntaxCommand()
@@ -117,3 +123,15 @@ void CPUDialog::on_chkBlendMode_stateChanged(int)
     pSettings->debugger().setBlendMode(ui->chkBlendMode->isCheckable());
     pSettings->debugger().save();
 }
+
+void CPUDialog::on_btnStepOverInstruction_clicked()
+{
+    pMainWindow->debugger()->sendCommand("-exec-next-instruction","");
+}
+
+
+void CPUDialog::on_btnStepIntoInstruction_clicked()
+{
+    pMainWindow->debugger()->sendCommand("-exec-step-instruction","");
+}
+
diff --git a/RedPandaIDE/widgets/cpudialog.h b/RedPandaIDE/widgets/cpudialog.h
index 6cbcbc17..08c6a3c4 100644
--- a/RedPandaIDE/widgets/cpudialog.h
+++ b/RedPandaIDE/widgets/cpudialog.h
@@ -15,6 +15,7 @@ public:
     explicit CPUDialog(QWidget *parent = nullptr);
     ~CPUDialog();
     void updateInfo();
+    void updateButtonStates(bool enable);
 public slots:
     void setDisassembly(const QString& file, const QString& funcName,const QStringList& lines);
 signals:
@@ -30,6 +31,8 @@ private slots:
     void on_rdIntel_toggled(bool checked);
     void on_rdATT_toggled(bool checked);
     void on_chkBlendMode_stateChanged(int arg1);
+    void on_btnStepOverInstruction_clicked();
+    void on_btnStepIntoInstruction_clicked();
 };
 
 #endif // CPUDIALOG_H
diff --git a/RedPandaIDE/widgets/cpudialog.ui b/RedPandaIDE/widgets/cpudialog.ui
index 21651ee7..dc3b809a 100644
--- a/RedPandaIDE/widgets/cpudialog.ui
+++ b/RedPandaIDE/widgets/cpudialog.ui
@@ -6,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>767</width>
+    <width>879</width>
     <height>498</height>
    </rect>
   </property>
@@ -110,6 +110,41 @@
           <property name="bottomMargin">
            <number>0</number>
           </property>
+          <item>
+           <widget class="QToolButton" name="btnStepOverInstruction">
+            <property name="text">
+             <string>Step over one machine instruction</string>
+            </property>
+            <property name="icon">
+             <iconset resource="../icons.qrc">
+              <normaloff>:/icons/images/newlook24/052-next.png</normaloff>:/icons/images/newlook24/052-next.png</iconset>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QToolButton" name="btnStepIntoInstruction">
+            <property name="text">
+             <string>Step into one machine instruction</string>
+            </property>
+            <property name="icon">
+             <iconset resource="../icons.qrc">
+              <normaloff>:/icons/images/newlook24/040-goto.png</normaloff>:/icons/images/newlook24/040-goto.png</iconset>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <spacer name="horizontalSpacer">
+            <property name="orientation">
+             <enum>Qt::Horizontal</enum>
+            </property>
+            <property name="sizeHint" stdset="0">
+             <size>
+              <width>40</width>
+              <height>20</height>
+             </size>
+            </property>
+           </spacer>
+          </item>
           <item>
            <widget class="QRadioButton" name="rdATT">
             <property name="text">
@@ -130,19 +165,6 @@
             </attribute>
            </widget>
           </item>
-          <item>
-           <spacer name="horizontalSpacer">
-            <property name="orientation">
-             <enum>Qt::Horizontal</enum>
-            </property>
-            <property name="sizeHint" stdset="0">
-             <size>
-              <width>40</width>
-              <height>20</height>
-             </size>
-            </property>
-           </spacer>
-          </item>
           <item>
            <widget class="QCheckBox" name="chkBlendMode">
             <property name="text">
@@ -181,7 +203,9 @@
    <container>1</container>
   </customwidget>
  </customwidgets>
- <resources/>
+ <resources>
+  <include location="../icons.qrc"/>
+ </resources>
  <connections/>
  <buttongroups>
   <buttongroup name="buttonGroup"/>