diff --git a/common/src/main/java/com/xypower/common/MicroPhotoContext.java b/common/src/main/java/com/xypower/common/MicroPhotoContext.java
index 706901a0..16d79fc2 100644
--- a/common/src/main/java/com/xypower/common/MicroPhotoContext.java
+++ b/common/src/main/java/com/xypower/common/MicroPhotoContext.java
@@ -1,5 +1,6 @@
 package com.xypower.common;
 
+import android.app.ActivityManager;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
@@ -17,6 +18,7 @@ import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.OutputStreamWriter;
 import java.io.UnsupportedEncodingException;
+import java.util.List;
 
 public class MicroPhotoContext {
 
@@ -92,6 +94,21 @@ public class MicroPhotoContext {
         return stringBuilder == null ? null : stringBuilder.toString();
     }
 
+    public static boolean isAppAlive(Context context, String packageName) {
+        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
+        List<ActivityManager.RunningServiceInfo> services = am.getRunningServices(Integer.MAX_VALUE);
+
+        boolean isRunning = false;
+        for (ActivityManager.RunningServiceInfo rsi : services) {
+            if (packageName.equalsIgnoreCase(rsi.service.getPackageName())) {
+                isRunning = true;
+                break;
+            }
+        }
+
+        return isRunning;
+    }
+
     public static String buildAppDir(Context contxt) {
 
         String path = Environment.getExternalStorageDirectory().getAbsolutePath();
diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java b/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java
index e786725f..764a30bc 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java
@@ -4,6 +4,7 @@ import android.content.Context;
 import android.os.Environment;
 import android.os.PowerManager;
 import android.os.SystemClock;
+import android.os.storage.StorageManager;
 import android.text.TextUtils;
 import android.util.Log;
 import android.util.Pair;
@@ -102,13 +103,7 @@ public class AppMaster {
             public void run() {
 
                 // mMasterUrl = "http://192.168.50.100/mntn/";
-                final Context context = mService.getApplicationContext();
-                String appPath = MicroPhotoContext.buildAppDir(context);
-                File mpappDb = new File(appPath + "data/App.db");
-                if (!mpappDb.exists() || ((System.currentTimeMillis() - mpappDb.lastModified()) > 1800000)) {
-                    // greater than 30m
-                    MicroPhotoContext.restartMpApp(context);
-                }
+
 
                 String masterUrl = mMasterUrl;
 
@@ -571,4 +566,5 @@ public class AppMaster {
     }
 
 
+
 }
diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
index e994242a..8825d277 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
@@ -121,6 +121,9 @@ public class MpMasterService extends Service {
 
     private String mSerialNo = null;
 
+    private long mTimeToStartMpApp = 0;
+    private long mTimeOfMpAppAlive = 1800000; // 30minutes
+
     public MpMasterService() {
     }
     @Override
@@ -184,6 +187,7 @@ public class MpMasterService extends Service {
         // AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
 
         startMaster();
+        startMpApp();
 
         registerHeartbeatTimer();
 
@@ -221,6 +225,36 @@ public class MpMasterService extends Service {
         return mCmdid;
     }
 
+    public void startMpApp() {
+        try {
+            final Context context = getApplicationContext();
+
+            if (MicroPhotoContext.isAppAlive(context, MicroPhotoContext.PACKAGE_NAME_MPAPP)) {
+                return;
+            }
+
+
+            String appPath = MicroPhotoContext.buildMpAppDir(context);
+            long ts = System.currentTimeMillis();
+            if (ts - mTimeToStartMpApp < 30000) {
+                return;
+            }
+
+            File mpappDb = new File(appPath + "data/App.db");
+            long modifiedTimeOfDb = 0;
+            if (mpappDb.exists()) {
+                modifiedTimeOfDb = mpappDb.lastModified();
+            }
+            if ((ts - modifiedTimeOfDb) > mTimeOfMpAppAlive) {
+                // greater than 30m
+                MicroPhotoContext.restartMpApp(context);
+                mTimeToStartMpApp = ts;
+            }
+        } catch (Exception ex) {
+
+        }
+    }
+
     public String getMpAppVersion() {
         if (TextUtils.isEmpty(mMpAppVersion)) {
             PackageManager packageManager = getPackageManager();
@@ -306,6 +340,7 @@ public class MpMasterService extends Service {
                 mService.registerHeartbeatTimer();
 
                 mService.startMaster();
+                mService.startMpApp();
 
             } else if (TextUtils.equals(ACTION_MSG_BROADCAST, action)) {
 
@@ -693,5 +728,9 @@ public class MpMasterService extends Service {
         SysApi.selectSimCard4Data(getApplicationContext(), num);
     }
 
+
+
+
     ////////////////////////GPS////////////////////
+    
 }
\ No newline at end of file