diff --git a/include/rtdebug.h b/include/rtdebug.h
index 735f5dba6fa98b23155b574e6952f7e6fc1c2de2..7a743f4d6079e9246f89d024068a1d8cd82a6374 100644
--- a/include/rtdebug.h
+++ b/include/rtdebug.h
@@ -7,17 +7,42 @@
 #ifdef RT_DEBUG
 
 /* Turn on some of these (set to non-zero) to debug kernel */
+#ifndef RT_DEBUG_MEM
 #define RT_DEBUG_MEM        0
+#endif
+
+#ifndef RT_DEBUG_MODULE
 #define RT_DEBUG_MODULE     0
+#endif
+
+#ifndef RT_DEBUG_SCHEDULER
 #define RT_DEBUG_SCHEDULER  0
+#endif
+
+#ifndef RT_DEBUG_SLAB
 #define RT_DEBUG_SLAB       0
+#endif
+
+#ifndef RT_DEBUG_THREAD
 #define RT_DEBUG_THREAD     0
+#endif
+
+#ifndef RT_DEBUG_TIMER
 #define RT_DEBUG_TIMER      0
+#endif
+
+#ifndef RT_DEBUG_IRQ
 #define RT_DEBUG_IRQ        0
+#endif
+
+#ifndef RT_DEBUG_IPC
 #define RT_DEBUG_IPC        0
+#endif
 
 /* Turn on this to enable reentrance check */
+#ifndef RT_DEBUG_REENT_CHK
 #define RT_DEBUG_REENT_CHK  1
+#endif
 
 #define RT_DEBUG_LOG(type,message)  do{ if(type) rt_kprintf message;}while(0)
 
@@ -54,7 +79,7 @@ extern rt_uint8_t rt_debug_reent_cnt;
 #else /* RT_DEBUG */
 
 #define RT_ASSERT(EX)
-#define RT_DEGUB_LOG(type,message)
+#define RT_DEBUG_LOG(type,message)
 #define RT_DEBUG_REENT_IN
 #define RT_DEBUG_REENT_OUT
 #define RT_DEBUG_NOT_REENT