diff --git a/applications/VK_Log.c b/applications/VK_Log.c
new file mode 100644
index 0000000..482a103
--- /dev/null
+++ b/applications/VK_Log.c
@@ -0,0 +1,29 @@
+#include "VK_Log.h"
+#include <ulog.h>
+
+static struct ulog_backend dev_backend;
+
+static rt_device_t log_dev = RT_NULL;
+
+
+static void dev_log_output(struct ulog_backend *backend,
+                             rt_uint32_t level,
+                             const char *tag,
+                             rt_bool_t is_raw,
+                             const char *log,
+                             size_t len)
+{
+    if (log_dev != RT_NULL && len > 0)
+    {
+        rt_device_write(log_dev, 0, log, len);
+    }
+}
+
+
+int dev_log_backend_init(rt_device_t dev){
+  log_dev = dev;
+  rt_memset(&dev_backend, 0 , sizeof(dev_backend));
+  dev_backend.output = dev_log_output;
+
+  return ulog_backend_register(&dev_backend, "uart3", RT_FALSE);
+} 
\ No newline at end of file
diff --git a/applications/VK_Log.h b/applications/VK_Log.h
new file mode 100644
index 0000000..4bc536a
--- /dev/null
+++ b/applications/VK_Log.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include "rtthread.h"
+#include "rtdevice.h"
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+
+int dev_log_backend_init(rt_device_t dev);
+
+
+
+#ifdef __cplusplus
+}
+#endif
\ No newline at end of file
diff --git a/applications/main.c b/applications/main.c
index dc792fb..a4e785f 100644
--- a/applications/main.c
+++ b/applications/main.c
@@ -19,6 +19,7 @@
 #include "VK_Client.h"
 #include "VK_Com.h"
 #include "drv_ec800k.h"
+#include "VK_Log.h"
 
 static rt_device_t u2, u3;
 
@@ -43,7 +44,9 @@ int main(void) {
                          RT_DEVICE_FLAG_RX_NON_BLOCKING |
                          RT_DEVICE_FLAG_TX_BLOCKING);
   BSP_LET_Register_Com(u2);
-
+  
+  //初始化ulog端口
+  dev_log_backend_init(u3);
   /* 创建任务2和任务3，分别从U2和U3收发数据 */
   lte_dev.tid1 =
       rt_thread_create("lte", task_let_entry, RT_NULL, 2048, 10, 5);