diff --git a/src/com/netease/qa/emmagee/service/EmmageeService.java b/src/com/netease/qa/emmagee/service/EmmageeService.java
index b985f51fd908f448a46287ef57e728a0c91204b2..d6f45c38534c60295ef8a2c8e741da932a5a3019 100644
--- a/src/com/netease/qa/emmagee/service/EmmageeService.java
+++ b/src/com/netease/qa/emmagee/service/EmmageeService.java
@@ -464,25 +464,26 @@ public class EmmageeService extends Service {
 						trafficMb = (double) tempTraffic / 1024;
 					}
 				}
+				// 如果cpu使用率存在且都不小于0，则输出
+				if (processCpuRatio != null && totalCpuRatio != null) {
+					txtUnusedMem.setText("应用/剩余内存:" + processMemory + "/" + freeMemoryKb + "MB");
+					txtTotalMem.setText("应用/总体CPU:" + processCpuRatio + "%/" + totalCpuRatio + "%");
+					String batt = "电流:" + currentBatt;
+					if ("-1".equals(trafficSize)) {
+						txtTraffic.setText(batt + ",流量:N/A");
+					} else if (isMb)
+						txtTraffic.setText(batt + ",流量:" + fomart.format(trafficMb) + "MB");
+					else
+						txtTraffic.setText(batt + ",流量:" + trafficSize + "KB");
+				}
+				// 当内存为0切cpu使用率为0时则是被测应用退出
+				if ("0".equals(processMemory) && "0.00".equals(processCpuRatio)) {
+					closeOpenedStream();
+					isServiceStop = true;
+					return;
+				}
 			}
-			// 如果cpu使用率存在且都不小于0，则输出
-			if (processCpuRatio != null && totalCpuRatio != null) {
-				txtUnusedMem.setText("应用/剩余内存:" + processMemory + "/" + freeMemoryKb + "MB");
-				txtTotalMem.setText("应用/总体CPU:" + processCpuRatio + "%/" + totalCpuRatio + "%");
-				String batt = "电流:" + currentBatt;
-				if ("-1".equals(trafficSize)) {
-					txtTraffic.setText(batt + ",流量:N/A");
-				} else if (isMb)
-					txtTraffic.setText(batt + ",流量:" + fomart.format(trafficMb) + "MB");
-				else
-					txtTraffic.setText(batt + ",流量:" + trafficSize + "KB");
-			}
-			// 当内存为0切cpu使用率为0时则是被测应用退出
-			if ("0".equals(processMemory) && "0.00".equals(processCpuRatio)) {
-				closeOpenedStream();
-				isServiceStop = true;
-				return;
-			}
+
 		}
 	}
 
diff --git a/src/com/netease/qa/emmagee/utils/CpuInfo.java b/src/com/netease/qa/emmagee/utils/CpuInfo.java
index 41eeab95d40407b470f4b49aac7f8c532a6b70de..4537d44ac6e745733135d491b39957c959713147 100644
--- a/src/com/netease/qa/emmagee/utils/CpuInfo.java
+++ b/src/com/netease/qa/emmagee/utils/CpuInfo.java
@@ -177,13 +177,11 @@ public class CpuInfo {
 					percent = fomart.format(((double) pidMemory / (double) totalMemorySize) * 100);
 				}
 
-				// 当应用的cpu使用率大于0时才写入文件中，过滤掉异常数据
-				if (isDouble(processCpuRatio) && isDouble(totalCpuRatio)) {
+				if (isPositive(processCpuRatio) && isPositive(totalCpuRatio)) {
 					// whether certain device supports traffic statics or not
-					if (traffic == -1) {						
+					if (traffic == -1) {
 						EmmageeService.bw.write(mDateTime2 + "," + pMemory + "," + percent + "," + fMemory + "," + processCpuRatio + ","
-								+ totalCpuRatio + "," + "N/A" + "," + totalBatt + "," + currentBatt + "," + temperature + "," + voltage
-								+ "\r\n");
+								+ totalCpuRatio + "," + "N/A" + "," + totalBatt + "," + currentBatt + "," + temperature + "," + voltage + "\r\n");
 					} else {
 						EmmageeService.bw.write(mDateTime2 + "," + pMemory + "," + percent + "," + fMemory + "," + processCpuRatio + ","
 								+ totalCpuRatio + "," + traffic + "," + totalBatt + "," + currentBatt + "," + temperature + "," + voltage + "\r\n");
@@ -198,24 +196,24 @@ public class CpuInfo {
 			}
 		} catch (IOException e) {
 			e.printStackTrace();
-			// PttService.closeOpenedStream()
 		}
 		return cpuUsedRatio;
 	}
 
 	/**
-	 * 判断text是否是一个double类型数据
+	 * is text a positive number
 	 * 
 	 * @param text
 	 * @return
 	 */
-	private boolean isDouble(String text) {
+	private boolean isPositive(String text) {
+		Double num;
 		try {
-			Double.parseDouble(text);
+			num = Double.parseDouble(text);
 		} catch (NumberFormatException e) {
 			return false;
 		}
-		return true;
+		return num >= 0;
 	}
 
 }