diff --git a/RedPandaIDE/compiler/executablerunner.cpp b/RedPandaIDE/compiler/executablerunner.cpp
index 0cd87a03..02d9d07c 100644
--- a/RedPandaIDE/compiler/executablerunner.cpp
+++ b/RedPandaIDE/compiler/executablerunner.cpp
@@ -38,6 +38,7 @@ ExecutableRunner::ExecutableRunner(const QString &filename, const QString &argum
     mStartConsole(false),
     mQuitSemaphore(0)
 {
+    setWaitForFinishTime(1000);
 }
 
 bool ExecutableRunner::startConsole() const
@@ -170,7 +171,7 @@ void ExecutableRunner::run()
     }
 
     while (true) {
-        mProcess->waitForFinished(1000);
+        mProcess->waitForFinished(mWaitForFinishTime);
         if (mProcess->state()!=QProcess::Running) {
             break;
         }
diff --git a/RedPandaIDE/compiler/ojproblemcasesrunner.cpp b/RedPandaIDE/compiler/ojproblemcasesrunner.cpp
index e2ccf6e2..a74266aa 100644
--- a/RedPandaIDE/compiler/ojproblemcasesrunner.cpp
+++ b/RedPandaIDE/compiler/ojproblemcasesrunner.cpp
@@ -27,6 +27,9 @@ OJProblemCasesRunner::OJProblemCasesRunner(const QString& filename, const QStrin
     Runner(filename,arguments,workDir,parent)
 {
     mProblemCases = problemCases;
+    mBufferSize = 8192;
+    mOutputRefreshTime = 1000;
+    setWaitForFinishTime(100);
 }
 
 OJProblemCasesRunner::OJProblemCasesRunner(const QString& filename, const QString& arguments, const QString& workDir,
@@ -34,6 +37,9 @@ OJProblemCasesRunner::OJProblemCasesRunner(const QString& filename, const QStrin
     Runner(filename,arguments,workDir,parent)
 {
     mProblemCases.append(problemCase);
+    mBufferSize = 8192;
+    mOutputRefreshTime = 1000;
+    setWaitForFinishTime(100);
 }
 
 void OJProblemCasesRunner::runCase(int index,POJProblemCase problemCase)
@@ -80,9 +86,10 @@ void OJProblemCasesRunner::runCase(int index,POJProblemCase problemCase)
     QByteArray readed;
     QByteArray buffer;
     QByteArray output;
+    int noOutputTime = 0;
     while (true) {
-        process.waitForFinished(100);
-        readed = process.read(5001);
+        process.waitForFinished(mWaitForFinishTime);
+        readed = process.read(mBufferSize);
         buffer += readed;
         if (process.state()!=QProcess::Running) {
             break;
@@ -97,10 +104,15 @@ void OJProblemCasesRunner::runCase(int index,POJProblemCase problemCase)
         }
         if (errorOccurred)
             break;
-        if (buffer.length()>5000) {
-            emit newOutputGetted(problemCase->getId(),QString::fromLocal8Bit(buffer));
-            output.append(buffer);
-            buffer.clear();
+        if (buffer.length()>=mBufferSize || noOutputTime > mOutputRefreshTime) {
+            if (!buffer.isEmpty()) {
+                emit newOutputGetted(problemCase->getId(),QString::fromLocal8Bit(buffer));
+                output.append(buffer);
+                buffer.clear();
+            }
+            noOutputTime = 0;
+        } else {
+            noOutputTime += mWaitForFinishTime;
         }
     }
     if (process.state() == QProcess::ProcessState::NotRunning)
@@ -146,4 +158,34 @@ void OJProblemCasesRunner::run()
     }
 }
 
+int OJProblemCasesRunner::waitForFinishTime() const
+{
+    return mWaitForFinishTime;
+}
+
+void OJProblemCasesRunner::setWaitForFinishTime(int newWaitForFinishTime)
+{
+    mWaitForFinishTime = newWaitForFinishTime;
+}
+
+int OJProblemCasesRunner::outputRefreshTime() const
+{
+    return mOutputRefreshTime;
+}
+
+void OJProblemCasesRunner::setOutputRefreshTime(int newOutputRefreshTime)
+{
+    mOutputRefreshTime = newOutputRefreshTime;
+}
+
+int OJProblemCasesRunner::bufferSize() const
+{
+    return mBufferSize;
+}
+
+void OJProblemCasesRunner::setBufferSize(int newBufferSize)
+{
+    mBufferSize = newBufferSize;
+}
+
 
diff --git a/RedPandaIDE/compiler/ojproblemcasesrunner.h b/RedPandaIDE/compiler/ojproblemcasesrunner.h
index c4d127b3..0a91cd20 100644
--- a/RedPandaIDE/compiler/ojproblemcasesrunner.h
+++ b/RedPandaIDE/compiler/ojproblemcasesrunner.h
@@ -29,6 +29,17 @@ public:
                                   const QVector<POJProblemCase>& problemCases, QObject *parent = nullptr);
     explicit OJProblemCasesRunner(const QString& filename, const QString& arguments, const QString& workDir,
                                   POJProblemCase problemCase, QObject *parent = nullptr);
+    //max size of output buffer
+    int bufferSize() const;
+    void setBufferSize(int newBufferSize);
+
+    //max time (in milliseconds) waiting to flush output buffer
+    int outputRefreshTime() const;
+    void setOutputRefreshTime(int newOutputRefreshTime);
+
+    int waitForFinishTime() const;
+    void setWaitForFinishTime(int newWaitForFinishTime);
+
 signals:
     void caseStarted(const QString& id, int current, int total);
     void caseFinished(const QString& id, int current, int total);
@@ -41,7 +52,9 @@ private:
     // QThread interface
 protected:
     void run() override;
-
+private:
+    int mBufferSize;
+    int mOutputRefreshTime;
 };
 
 #endif // OJPROBLEMCASESRUNNER_H
diff --git a/RedPandaIDE/compiler/runner.cpp b/RedPandaIDE/compiler/runner.cpp
index bbb60cdf..3771a923 100644
--- a/RedPandaIDE/compiler/runner.cpp
+++ b/RedPandaIDE/compiler/runner.cpp
@@ -23,7 +23,8 @@ Runner::Runner(const QString &filename, const QString &arguments, const QString
     mStop(false),
     mFilename(filename),
     mArguments(arguments),
-    mWorkDir(workDir)
+    mWorkDir(workDir),
+    mWaitForFinishTime(1000)
 {
 
 }
@@ -49,3 +50,13 @@ void Runner::setPausing(bool newCanFinish)
     mPausing = newCanFinish;
 }
 
+int Runner::waitForFinishTime() const
+{
+    return mWaitForFinishTime;
+}
+
+void Runner::setWaitForFinishTime(int newWaitForFinishTime)
+{
+    mWaitForFinishTime = newWaitForFinishTime;
+}
+
diff --git a/RedPandaIDE/compiler/runner.h b/RedPandaIDE/compiler/runner.h
index d6c7a8a1..9ef0b026 100644
--- a/RedPandaIDE/compiler/runner.h
+++ b/RedPandaIDE/compiler/runner.h
@@ -27,6 +27,9 @@ public:
 
     bool pausing() const;
 
+    // time (in milliseconds) waiting for process finished in each processing loop
+    int waitForFinishTime() const;
+    void setWaitForFinishTime(int newWaitForFinishTime);
 
 signals:
     void started();
@@ -45,6 +48,7 @@ protected:
     QString mFilename;
     QString mArguments;
     QString mWorkDir;
+    int mWaitForFinishTime;
 };
 
 #endif // RUNNER_H