diff --git a/components/dfs/src/dfs.c b/components/dfs/src/dfs.c
index 8155b088f0f38ef1c5dfe3b1463d8442bd138f16..c91a9c6ef866e1fe450c92c9a1ce1913ab323eb1 100644
--- a/components/dfs/src/dfs.c
+++ b/components/dfs/src/dfs.c
@@ -18,7 +18,7 @@
 #include <lwp.h>
 #endif
 
-#if defined(RT_USING_DFS_DEVFS) && defined(RT_USING_POSIX)
+#if defined(RT_USING_DFS_DEVFS) && defined(RT_USING_LIBC)
 #include <libc.h>
 #endif
 
@@ -216,7 +216,7 @@ struct dfs_fd *fd_get(int fd)
     struct dfs_fd *d;
     struct dfs_fdtable *fdt;
 
-#if defined(RT_USING_DFS_DEVFS) && defined(RT_USING_POSIX)
+#if defined(RT_USING_DFS_DEVFS) && defined(RT_USING_LIBC)
     if ((0 <= fd) && (fd <= 2))
         fd = libc_stdio_get_console();
 #endif
diff --git a/components/libc/compilers/armlibc/libc.c b/components/libc/compilers/armlibc/libc.c
index 889c68730955b26a2d245a614178a63f223f4d0f..82f42f50475a29844f76bb6c4cf22097a73c5acf 100644
--- a/components/libc/compilers/armlibc/libc.c
+++ b/components/libc/compilers/armlibc/libc.c
@@ -17,23 +17,23 @@
 
 int libc_system_init(void)
 {
-#if defined(RT_USING_DFS) & defined(RT_USING_DFS_DEVFS)
+#ifdef RT_USING_DFS_DEVFS
     rt_device_t dev_console;
 
     dev_console = rt_console_get_device();
     if (dev_console)
     {
-    #if defined(RT_USING_POSIX)
+    #ifdef RT_USING_POSIX
         libc_stdio_set_console(dev_console->parent.name, O_RDWR);
     #else
         libc_stdio_set_console(dev_console->parent.name, O_WRONLY);
-    #endif
+    #endif /* RT_USING_POSIX */
     }
-#endif
+#endif /* RT_USING_DFS_DEVFS */
 
-#if defined RT_USING_PTHREADS && !defined RT_USING_COMPONENTS_INIT
+#if defined(RT_USING_PTHREADS) && !defined(RT_USING_COMPONENTS_INIT)
     pthread_system_init();
-#endif
+#endif /* defined(RT_USING_PTHREADS) && !defined(RT_USING_COMPONENTS_INIT) */
 
     return 0;
 }
diff --git a/components/libc/compilers/armlibc/syscalls.c b/components/libc/compilers/armlibc/syscalls.c
index ccdcfc86ea3341cf9d6d72689a2e95438c93cc25..0142c3335daf53eaa198d347edb0b38956cac636 100644
--- a/components/libc/compilers/armlibc/syscalls.c
+++ b/components/libc/compilers/armlibc/syscalls.c
@@ -187,14 +187,14 @@ int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
 {
 #ifdef RT_USING_DFS
     int size;
-#endif
+#endif /* RT_USING_DFS */
 
     if ((fh == STDOUT) || (fh == STDERR))
     {
 #if !defined(RT_USING_CONSOLE) || !defined(RT_USING_DEVICE)
         return 0;
 #else
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_DFS
         if (libc_stdio_get_console() < 0)
         {
             LOG_W("Do not invoke standard input before initializing libc");
@@ -210,8 +210,8 @@ int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
         }
 
         return -1;
-#endif
-#endif
+#endif /* RT_USING_DFS */
+#endif /* !defined(RT_USING_CONSOLE) || !defined(RT_USING_DEVICE) */
     }
     else if (fh == STDIN)
     {
@@ -226,7 +226,7 @@ int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
         return len - size;
     else
         return -1;
-#endif
+#endif /* RT_USING_DFS */
 }
 
 /*
diff --git a/components/libc/compilers/dlib/libc.c b/components/libc/compilers/dlib/libc.c
index f540ac955f988d6611892ffaed8462e67e51a5e0..ac3d78f1f97f2b3ec19cf93f67e8cb7d0c41fe71 100644
--- a/components/libc/compilers/dlib/libc.c
+++ b/components/libc/compilers/dlib/libc.c
@@ -17,23 +17,23 @@
 
 int libc_system_init(void)
 {
-#if defined(RT_USING_DFS) && defined(RT_USING_DFS_DEVFS)
+#ifdef RT_USING_DFS_DEVFS
     rt_device_t dev_console;
 
     dev_console = rt_console_get_device();
     if (dev_console)
     {
-    #if defined(RT_USING_POSIX)
+    #ifdef RT_USING_POSIX
         libc_stdio_set_console(dev_console->parent.name, O_RDWR);
     #else
         libc_stdio_set_console(dev_console->parent.name, O_WRONLY);
-    #endif
+    #endif /* RT_USING_POSIX */
     }
-#endif
+#endif /* RT_USING_DFS_DEVFS */
 
 #if defined (RT_USING_PTHREADS) && !defined (RT_USING_COMPONENTS_INIT)
     pthread_system_init();
-#endif
+#endif /* defined (RT_USING_PTHREADS) && !defined (RT_USING_COMPONENTS_INIT) */
 
     return 0;
 }
diff --git a/components/libc/compilers/dlib/syscall_write.c b/components/libc/compilers/dlib/syscall_write.c
index ffee51882d405bc5fd22dbd499c318c4dae3e21e..481e9f8c3d58f43aa19580eeacc3cfc9a06995ee 100644
--- a/components/libc/compilers/dlib/syscall_write.c
+++ b/components/libc/compilers/dlib/syscall_write.c
@@ -25,7 +25,7 @@ size_t __write(int handle, const unsigned char *buf, size_t len)
 {
 #ifdef RT_USING_DFS
     int size;
-#endif
+#endif /* RT_USING_DFS */
 
     if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR))
     {
@@ -33,7 +33,7 @@ size_t __write(int handle, const unsigned char *buf, size_t len)
         return _LLIO_ERROR;
 #else
 
-#ifdef RT_USING_POSIX
+#ifdef RT_USING_DFS
         if (libc_stdio_get_console() < 0)
         {
             LOG_W("Do not invoke standard output before initializing libc");
@@ -50,8 +50,8 @@ size_t __write(int handle, const unsigned char *buf, size_t len)
         }
 
         return len;
-#endif
-#endif
+#endif /* RT_USING_DFS */
+#endif /* RT_USING_CONSOLE */
     }
     else if (handle == _LLIO_STDIN)
     {
@@ -63,6 +63,6 @@ size_t __write(int handle, const unsigned char *buf, size_t len)
 #else
     size = write(handle, buf, len);
     return size;
-#endif
+#endif /* RT_USING_DFS */
 }
 
diff --git a/components/libc/compilers/gcc/newlib/libc.c b/components/libc/compilers/gcc/newlib/libc.c
index 9834a9a015438e2554a5591fadb5e628a626a9cf..20d41a521bb54661feb0fda6dbd4fd3fc7fb9907 100644
--- a/components/libc/compilers/gcc/newlib/libc.c
+++ b/components/libc/compilers/gcc/newlib/libc.c
@@ -23,7 +23,7 @@ int _EXFUN(putenv,(char *__string));
 
 int libc_system_init(void)
 {
-#if defined(RT_USING_DFS) & defined(RT_USING_DFS_DEVFS) & defined(RT_USING_CONSOLE)
+#if defined(RT_USING_DFS_DEVFS) & defined(RT_USING_CONSOLE)
     rt_device_t dev_console;
 
     dev_console = rt_console_get_device();
@@ -39,11 +39,11 @@ int libc_system_init(void)
     /* set PATH and HOME */
     putenv("PATH=/bin");
     putenv("HOME=/home");
-#endif
+#endif /* defined(RT_USING_DFS_DEVFS) & defined(RT_USING_CONSOLE) */
 
-#if defined RT_USING_PTHREADS && !defined RT_USING_COMPONENTS_INIT
+#if defined(RT_USING_PTHREADS) && !defined(RT_USING_COMPONENTS_INIT)
     pthread_system_init();
-#endif
+#endif /* defined(RT_USING_PTHREADS) && !defined(RT_USING_COMPONENTS_INIT) */
 
     return 0;
 }