diff --git a/cctp-atu/atu-upper-computer/src/main/java/net/northking/cctp/upperComputer/driver/ios/NKAgent.java b/cctp-atu/atu-upper-computer/src/main/java/net/northking/cctp/upperComputer/driver/ios/NKAgent.java
index 051faa6..3696733 100644
--- a/cctp-atu/atu-upper-computer/src/main/java/net/northking/cctp/upperComputer/driver/ios/NKAgent.java
+++ b/cctp-atu/atu-upper-computer/src/main/java/net/northking/cctp/upperComputer/driver/ios/NKAgent.java
@@ -276,6 +276,23 @@ public final class NKAgent {
         return screenShotData;
     }
 
+    /**
+     * 杀死app
+     * @param string bundleId
+     * @return 是否成功
+     */
+    public boolean terminateApp(String string) {
+        if (string.isEmpty()) {
+            throw new IllegalArgumentException("bundleId不能为空");
+        }
+        TextData data = new TextData();
+        data.setText(string);
+        ICommandPacket packet = packetTransfer.syncSend(34, data);
+        if (packet == null) return false;
+        BooleanCommandData bool = new BooleanCommandData();
+        packet.fillICommandData(bool);
+        return bool.isSuccess();
+    }
 
 
     public boolean getStatus() {
diff --git a/cctp-atu/atu-upper-computer/src/main/java/net/northking/cctp/upperComputer/driver/ios/command/data/ScreenShotData.java b/cctp-atu/atu-upper-computer/src/main/java/net/northking/cctp/upperComputer/driver/ios/command/data/ScreenShotData.java
index 1e33052..c494c7a 100644
--- a/cctp-atu/atu-upper-computer/src/main/java/net/northking/cctp/upperComputer/driver/ios/command/data/ScreenShotData.java
+++ b/cctp-atu/atu-upper-computer/src/main/java/net/northking/cctp/upperComputer/driver/ios/command/data/ScreenShotData.java
@@ -15,13 +15,17 @@ public class ScreenShotData implements ICommandData {
     @Override
     public void buildFromInput(DataInput dataInput) throws IOException {
         dataLength = dataInput.readInt();
-        data = new byte[dataLength];
-        dataInput.readFully(data);
+        if (dataLength > 0) {
+            data = new byte[dataLength];
+            dataInput.readFully(data);
+        }
     }
 
     @Override
     public void encodeToOutput(DataOutput dataOutput) throws IOException {
-        dataOutput.writeInt(dataLength);
-        dataOutput.write(data);
+        if (dataLength > 0) {
+            dataOutput.writeInt(dataLength);
+            dataOutput.write(data);
+        }
     }
 }
diff --git a/cctp-atu/atu-upper-computer/src/main/java/net/northking/cctp/upperComputer/service/IosDebuggerServiceImpl.java b/cctp-atu/atu-upper-computer/src/main/java/net/northking/cctp/upperComputer/service/IosDebuggerServiceImpl.java
index 151236e..5e92e5a 100644
--- a/cctp-atu/atu-upper-computer/src/main/java/net/northking/cctp/upperComputer/service/IosDebuggerServiceImpl.java
+++ b/cctp-atu/atu-upper-computer/src/main/java/net/northking/cctp/upperComputer/service/IosDebuggerServiceImpl.java
@@ -7,6 +7,8 @@ import io.appium.java_client.AppiumDriver;
 import net.northking.cctp.upperComputer.config.MobileProperty;
 import net.northking.cctp.upperComputer.deviceManager.common.PyMobileDevice;
 import net.northking.cctp.upperComputer.deviceManager.screen.IosScreenResponseThread;
+import net.northking.cctp.upperComputer.deviceManager.thread.IosDeviceInitThread;
+import net.northking.cctp.upperComputer.driver.ios.NKAgent;
 import net.northking.cctp.upperComputer.entity.Attachment;
 import net.northking.cctp.upperComputer.entity.DebuggerDeviceInfo;
 import net.northking.cctp.upperComputer.entity.PhoneEntity;
@@ -323,8 +325,8 @@ public class IosDebuggerServiceImpl extends AbstractDebuggerService {
     public boolean terminateApp(String deviceId, String appPackage) {
         boolean flag = deviceHandleHelper instanceof MacIosHandleHelper;
         if (flag) {
-            PyMobileDevice.SpecificAppleDeviceInfo specificAppleDeviceInfo = IOSDeviceManager.getInstance().getSpecificAppleDeviceInfo(deviceId);
-            boolean killFlag = PyMobileDevice.getInstance().pkill(specificAppleDeviceInfo, appPackage);
+            NKAgent nkAgent = getNkAgent(deviceId);
+            boolean killFlag = nkAgent.terminateApp(appPackage);
             if (killFlag) {
                 logger.info("设备{}，执行关闭应用 {} 命令成功", deviceId, appPackage);
             } else {
@@ -382,4 +384,15 @@ public class IosDebuggerServiceImpl extends AbstractDebuggerService {
         queryDeviceInfoMap.put(info.getCaseId(), deviceAllInfoThread);
         return true;
     }
+    private NKAgent getNkAgent(String deviceId) {
+        IosDeviceInitThread iosInitThread = IOSDeviceManager.getInstance().getIosInitThread(deviceId);
+        if (null == iosInitThread || !iosInitThread.isAlive() || iosInitThread.isInterrupted()) {
+            throw new ExecuteException("设备已经掉线，请重新接入设备");
+        }
+        NKAgent nkAgent = iosInitThread.getNkAgent();
+        if (!nkAgent.getStatus()) {
+            throw new ExecuteException("设备Agent还未准备好，稍后再试");
+        }
+        return nkAgent;
+    }
 }