diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 44e926a..1368e4a 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.netease.qa.emmagee"
-    android:versionCode="33"
-    android:versionName="2.5" >
+    android:versionCode="34"
+    android:versionName="2.5.1" >
 
     <uses-sdk android:minSdkVersion="8" />
 
@@ -52,6 +52,5 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.GET_TASKS" />
-    <uses-permission android:name="android.permission.WAKE_LOCK" />
 
 </manifest>
\ No newline at end of file
diff --git a/src/com/netease/qa/emmagee/utils/TrafficInfo.java b/src/com/netease/qa/emmagee/utils/TrafficInfo.java
index 5e6a04f..c0f4b00 100644
--- a/src/com/netease/qa/emmagee/utils/TrafficInfo.java
+++ b/src/com/netease/qa/emmagee/utils/TrafficInfo.java
@@ -16,6 +16,9 @@
  */
 package com.netease.qa.emmagee.utils;
 
+import java.io.IOException;
+import java.io.RandomAccessFile;
+
 import android.net.TrafficStats;
 import android.util.Log;
 
@@ -43,18 +46,52 @@ public TrafficInfo(String uid) {
 	 */
 	public long getTrafficInfo() {
 		Log.i(LOG_TAG, "get traffic information");
+		Log.d(LOG_TAG, "uid = " + uid);
+		long traffic = trafficFromApi();
+		return traffic <= 0 ? trafficFromFiles() : traffic;
+	}
 
-		long rcvTraffic = UNSUPPORTED;
-		long sndTraffic = UNSUPPORTED;
-
-		// Use getUidRxBytes and getUidTxBytes to get network traffic,these API
-		// return both tcp and udp usage
+	/**
+	 * Use TrafficStats getUidRxBytes and getUidTxBytes to get network
+	 * traffic,these API return both tcp and udp usage
+	 * 
+	 * @return
+	 */
+	private long trafficFromApi() {
+		long rcvTraffic = UNSUPPORTED, sndTraffic = UNSUPPORTED;
 		rcvTraffic = TrafficStats.getUidRxBytes(Integer.parseInt(uid));
 		sndTraffic = TrafficStats.getUidTxBytes(Integer.parseInt(uid));
+		return rcvTraffic + sndTraffic < 0 ? UNSUPPORTED : rcvTraffic + sndTraffic;
+	}
 
-		if (rcvTraffic == UNSUPPORTED || sndTraffic == UNSUPPORTED) {
-			return UNSUPPORTED;
-		} else
-			return rcvTraffic + sndTraffic;
+	/**
+	 * read files in uid_stat to get traffic info
+	 * 
+	 * @return
+	 */
+	private long trafficFromFiles() {
+		RandomAccessFile rafRcv = null, rafSnd = null;
+		long rcvTraffic = UNSUPPORTED, sndTraffic = UNSUPPORTED;
+		String rcvPath = "/proc/uid_stat/" + uid + "/tcp_rcv";
+		String sndPath = "/proc/uid_stat/" + uid + "/tcp_snd";
+		try {
+			rafRcv = new RandomAccessFile(rcvPath, "r");
+			rafSnd = new RandomAccessFile(sndPath, "r");
+			rcvTraffic = Long.parseLong(rafRcv.readLine());
+			sndTraffic = Long.parseLong(rafSnd.readLine());
+			Log.d(LOG_TAG, String.format("rcvTraffic, sndTraffic = %s, %s", rcvTraffic, sndTraffic));
+		} catch (Exception e) {
+		} 
+		finally {
+			try {
+				if (rafRcv != null) {
+					rafRcv.close();
+				}
+				if (rafSnd != null)
+					rafSnd.close();
+			} catch (IOException e) {}
+		}
+		return rcvTraffic + sndTraffic < 0 ? UNSUPPORTED : rcvTraffic + sndTraffic;
 	}
+
 }