diff --git a/src/main/java/net/geedge/api/controller/APIController.java b/src/main/java/net/geedge/api/controller/APIController.java
index 182f9d6..db2eee3 100644
--- a/src/main/java/net/geedge/api/controller/APIController.java
+++ b/src/main/java/net/geedge/api/controller/APIController.java
@@ -142,7 +142,7 @@ public class APIController {
     }
 
     @DeleteMapping("/pcap")
-    public void stopTcpdump(@RequestParam String id,
+    public synchronized void stopTcpdump(@RequestParam String id,
                             @RequestParam(required = false, defaultValue = "false") Boolean returnFile,
                             HttpServletResponse response) throws IOException {
         AdbUtil.CommandResult result = adbUtil.stopTcpdump(id);
diff --git a/src/main/java/net/geedge/api/util/AdbUtil.java b/src/main/java/net/geedge/api/util/AdbUtil.java
index a17230b..61a66d3 100644
--- a/src/main/java/net/geedge/api/util/AdbUtil.java
+++ b/src/main/java/net/geedge/api/util/AdbUtil.java
@@ -641,6 +641,21 @@ public class AdbUtil {
                 .serial(this.getSerial())
                 .buildShellCommand(String.format("shell \"ps -ef | grep tcpdump | grep -v grep | grep %s | awk '{print $2}' | xargs kill -INT \"", id))
                 .build());
+
+        // 等待 tcpdump 资源释放，避免出现错误：The capture file appears to have been cut short in the middle of a packet.
+        for (int i = 0; i < 10; i++) {
+            T.ThreadUtil.sleep(500);
+
+            String str = CommandExec.exec(AdbCommandBuilder.builder()
+                    .serial(this.getSerial())
+                    .buildShellCommand(String.format("shell \"ps -ef | grep tcpdump | grep -v grep | grep %s \"", id))
+                    .build());
+            log.info("[stopTcpdump] [id: {}] [is running: {}]", id, str);
+            if (T.StrUtil.isEmpty(str)) {
+                break;
+            }
+        }
+
         log.info("[stopTcpdump] [id: {}] [pcapFilePath: {}] [result: {}]", id, pcapFilePath, result);
         if (T.StrUtil.isEmpty(result)) {
             return new CommandResult(0, pcapFilePath);
diff --git a/src/main/java/net/geedge/common/T.java b/src/main/java/net/geedge/common/T.java
index 8bb3b1a..c098b77 100644
--- a/src/main/java/net/geedge/common/T.java
+++ b/src/main/java/net/geedge/common/T.java
@@ -204,10 +204,12 @@ public class T {
     }
 
     public static class ResponseUtil {
+        static Log log = Log.get();
         /**
          * reponse 下载 byte数据
          */
         public static void downloadFile(HttpServletResponse response, String filename, byte[] data) throws IORuntimeException, IOException {
+            log.info("[downloadFile] [fileName: {}] [size: {}]", filename, data.length);
             response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
             String fileName = T.URLUtil.encode(filename, T.CharsetUtil.CHARSET_UTF_8);
             cn.hutool.core.util.ReflectUtil.invoke(response, "addHeader", "Content-Disposition", "attachment; filename=" + fileName);