diff --git a/examples/network/tcpclient.c b/examples/network/tcpclient.c
index 793c71258a..d4c96f893a 100644
--- a/examples/network/tcpclient.c
+++ b/examples/network/tcpclient.c
@@ -160,15 +160,15 @@ __exit:
 
 static void usage(void)
 {
-    LOG_I("Usage: tcpclient -h <host> -p <port>");
-    LOG_I("       tcpclient --stop");
-    LOG_I("       tcpclient --help");
-    LOG_I("");
-    LOG_I("Miscellaneous:");
-    LOG_I("  -h           Specify host address");
-    LOG_I("  -p           Specify the host port number");
-    LOG_I("  --stop       Stop tcpclient program");
-    LOG_I("  --help       Print help information");
+    rt_kprintf("Usage: tcpclient -h <host> -p <port>\n");
+    rt_kprintf("       tcpclient --stop\n");
+    rt_kprintf("       tcpclient --help\n");
+    rt_kprintf("\n");
+    rt_kprintf("Miscellaneous:\n");
+    rt_kprintf("  -h           Specify host address\n");
+    rt_kprintf("  -p           Specify the host port number\n");
+    rt_kprintf("  --stop       Stop tcpclient program\n");
+    rt_kprintf("  --help       Print help information\n");
 }
 
 static void tcpclient_test(int argc, char** argv)
diff --git a/examples/network/tcpserver.c b/examples/network/tcpserver.c
index 1e068451b4..264b6f7c83 100644
--- a/examples/network/tcpserver.c
+++ b/examples/network/tcpserver.c
@@ -197,14 +197,14 @@ __exit:
 
 static void usage(void)
 {
-    LOG_I("Usage: tcpserver -p <port>");
-    LOG_I("       tcpserver --stop");
-    LOG_I("       tcpserver --help");
-    LOG_I("");
-    LOG_I("Miscellaneous:");
-    LOG_I("  -p           Specify the host port number");
-    LOG_I("  --stop       Stop tcpserver program");
-    LOG_I("  --help       Print help information");
+    rt_kprintf("Usage: tcpserver -p <port>\n");
+    rt_kprintf("       tcpserver --stop\n");
+    rt_kprintf("       tcpserver --help\n");
+    rt_kprintf("\n");
+    rt_kprintf("Miscellaneous:\n");
+    rt_kprintf("  -p           Specify the host port number\n");
+    rt_kprintf("  --stop       Stop tcpserver program\n");
+    rt_kprintf("  --help       Print help information\n");
 }
 
 static void tcpserver_test(int argc, char** argv)
diff --git a/examples/network/udpclient.c b/examples/network/udpclient.c
index 80cf521adf..40542b9fa1 100644
--- a/examples/network/udpclient.c
+++ b/examples/network/udpclient.c
@@ -83,16 +83,16 @@ static void udpclient(void *arg)
 
 static void usage(void)
 {
-    LOG_I("Usage: udpclient -h <host> -p <port> [--cnt] [count]");
-    LOG_I("       udpclient --stop");
-    LOG_I("       udpclient --help");
-    LOG_I("");
-    LOG_I("Miscellaneous:");
-    LOG_I("  -h           Specify host address");
-    LOG_I("  -p           Specify the host port number");
-    LOG_I("  --cnt        Specify the send data count");
-    LOG_I("  --stop       Stop tcpclient program");
-    LOG_I("  --help       Print help information");
+    rt_kprintf("Usage: udpclient -h <host> -p <port> [--cnt] [count]\n");
+    rt_kprintf("       udpclient --stop\n");
+    rt_kprintf("       udpclient --help\n");
+    rt_kprintf("\n");
+    rt_kprintf("Miscellaneous:\n");
+    rt_kprintf("  -h           Specify host address\n");
+    rt_kprintf("  -p           Specify the host port number\n");
+    rt_kprintf("  --cnt        Specify the send data count\n");
+    rt_kprintf("  --stop       Stop tcpclient program\n");
+    rt_kprintf("  --help       Print help information\n");
 }
 
 static void udpclient_test(int argc, char** argv)
diff --git a/examples/network/udpserver.c b/examples/network/udpserver.c
index 15cc2096d6..c40a1972b4 100644
--- a/examples/network/udpserver.c
+++ b/examples/network/udpserver.c
@@ -131,14 +131,14 @@ __exit:
 
 static void usage(void)
 {
-    LOG_I("Usage: udpserver -p <port>");
-    LOG_I("       udpserver --stop");
-    LOG_I("       udpserver --help");
-    LOG_I("");
-    LOG_I("Miscellaneous:");
-    LOG_I("  -p           Specify the host port number");
-    LOG_I("  --stop       Stop udpserver program");
-    LOG_I("  --help       Print help information");
+    rt_kprintf("Usage: udpserver -p <port>\n");
+    rt_kprintf("       udpserver --stop\n");
+    rt_kprintf("       udpserver --help\n");
+    rt_kprintf("\n");
+    rt_kprintf("Miscellaneous:\n");
+    rt_kprintf("  -p           Specify the host port number\n");
+    rt_kprintf("  --stop       Stop udpserver program\n");
+    rt_kprintf("  --help       Print help information\n");
 }
 
 static void udpserver_test(int argc, char** argv)