diff --git a/Ubiquitous/XiUOS/kernel/memory/byte_manage.c b/Ubiquitous/XiUOS/kernel/memory/byte_manage.c
index 78913de0..e3e1f166 100644
--- a/Ubiquitous/XiUOS/kernel/memory/byte_manage.c
+++ b/Ubiquitous/XiUOS/kernel/memory/byte_manage.c
@@ -953,7 +953,7 @@ void *x_umalloc(x_size_t size)
 	lock = CriticalAreaLock();
     /* alignment */
 	size = ALIGN_MEN_UP(size, MEM_ALIGN_SIZE);
-    ret = UserByteManager.dynamic_buddy_manager.done->malloc(&UserByteManager.dynamic_buddy_manager,size);
+    ret = UserByteManager.dynamic_buddy_manager.done->malloc(&UserByteManager.dynamic_buddy_manager,size,DYNAMIC_BLOCK_NO_EXTMEM_MASK);
     if(ret != NONE)
         CHECK(UserByteManager.dynamic_buddy_manager.done->JudgeLegal(&UserByteManager.dynamic_buddy_manager, ret - SIZEOF_DYNAMICALLOCNODE_MEM));