diff --git a/src/memheap.c b/src/memheap.c
index afa06fb9bf..ebd86b87d6 100644
--- a/src/memheap.c
+++ b/src/memheap.c
@@ -35,6 +35,45 @@
 
 #define RT_MEMHEAP_SIZE         RT_ALIGN(sizeof(struct rt_memheap_item), RT_ALIGN_SIZE)
 #define MEMITEM_SIZE(item)      ((rt_ubase_t)item->next - (rt_ubase_t)item - RT_MEMHEAP_SIZE)
+#define MEMITEM(ptr)            (struct rt_memheap_item*)((rt_uint8_t*)ptr - RT_MEMHEAP_SIZE)
+
+#ifdef RT_USING_MEMTRACE
+rt_inline void rt_memheap_setname(struct rt_memheap_item *item, const char *name)
+{
+    int index;
+    rt_uint8_t* ptr;
+
+    ptr = (rt_uint8_t*)&(item->next_free);
+    for (index = 0; index < sizeof(void*); index ++)
+    {
+        if (name[index] == '\0') break;
+        ptr[index] = name[index];
+    }
+    if (name[index] == '\0') ptr[index] = '\0';
+    else 
+    {
+        ptr = (rt_uint8_t*)&(item->prev_free);
+        for (index = 0; index < sizeof(void*) && (index + sizeof(void*))< RT_NAME_MAX; index ++)
+        {
+            if (name[sizeof(void*) + index] == '\0') break;
+            ptr[index] = name[sizeof(void*) + index];
+        }
+
+        if (name[sizeof(void*) + index] == '\0') ptr[index] = '\0';
+    }
+}
+
+void rt_mem_set_tag(void* ptr, const char* name)
+{
+    struct rt_memheap_item* item;
+
+    if (ptr && name)
+    {
+        item = MEMITEM(ptr);
+        rt_memheap_setname(item, name);
+    }
+}
+#endif
 
 /*
  * The initialized memory pool will be:
@@ -66,7 +105,7 @@ rt_err_t rt_memheap_init(struct rt_memheap *memheap,
 
     /* initialize the free list header */
     item            = &(memheap->free_header);
-    item->magic     = RT_MEMHEAP_MAGIC;
+    item->magic     = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_FREED);
     item->pool_ptr  = memheap;
     item->next      = RT_NULL;
     item->prev      = RT_NULL;
@@ -78,7 +117,7 @@ rt_err_t rt_memheap_init(struct rt_memheap *memheap,
 
     /* initialize the first big memory block */
     item            = (struct rt_memheap_item *)start_addr;
-    item->magic     = RT_MEMHEAP_MAGIC;
+    item->magic     = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_FREED);
     item->pool_ptr  = memheap;
     item->next      = RT_NULL;
     item->prev      = RT_NULL;
@@ -103,7 +142,7 @@ rt_err_t rt_memheap_init(struct rt_memheap *memheap,
      */
     item = item->next;
     /* it's a used memory block */
-    item->magic     = RT_MEMHEAP_MAGIC | RT_MEMHEAP_USED;
+    item->magic     = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_USED);
     item->pool_ptr  = memheap;
     item->next      = (struct rt_memheap_item *)start_addr;
     item->prev      = (struct rt_memheap_item *)start_addr;
@@ -201,7 +240,7 @@ void *rt_memheap_alloc(struct rt_memheap *heap, rt_size_t size)
                               new_ptr));
 
                 /* mark the new block as a memory block and freed. */
-                new_ptr->magic = RT_MEMHEAP_MAGIC;
+                new_ptr->magic = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_FREED);
 
                 /* put the pool pointer into the new block. */
                 new_ptr->pool_ptr = heap;
@@ -255,7 +294,7 @@ void *rt_memheap_alloc(struct rt_memheap *heap, rt_size_t size)
             }
 
             /* Mark the allocated block as not available. */
-            header_ptr->magic |= RT_MEMHEAP_USED;
+            header_ptr->magic = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_USED);
 
             /* release lock */
             rt_sem_release(&(heap->lock));
@@ -376,7 +415,7 @@ void *rt_memheap_realloc(struct rt_memheap *heap, void *ptr, rt_size_t newsize)
                               next_ptr->prev));
 
                 /* mark the new block as a memory block and freed. */
-                next_ptr->magic = RT_MEMHEAP_MAGIC;
+                next_ptr->magic = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_FREED);
 
                 /* put the pool pointer into the new block. */
                 next_ptr->pool_ptr = heap;
@@ -441,7 +480,7 @@ void *rt_memheap_realloc(struct rt_memheap *heap, void *ptr, rt_size_t newsize)
                   new_ptr));
 
     /* mark the new block as a memory block and freed. */
-    new_ptr->magic = RT_MEMHEAP_MAGIC;
+    new_ptr->magic = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_FREED);
     /* put the pool pointer into the new block. */
     new_ptr->pool_ptr = heap;
 
@@ -512,8 +551,11 @@ void rt_memheap_free(void *ptr)
                                     ptr, header_ptr));
 
     /* check magic */
-    RT_ASSERT((header_ptr->magic & RT_MEMHEAP_MASK) == RT_MEMHEAP_MAGIC);
-    RT_ASSERT(header_ptr->magic & RT_MEMHEAP_USED);
+    if (header_ptr->magic != (RT_MEMHEAP_MAGIC | RT_MEMHEAP_USED))
+    {
+        RT_DEBUG_LOG("bad magic:0x%08x @ memheap\n", header_ptr->magic);
+    }
+    RT_ASSERT(header_ptr->magic == (RT_MEMHEAP_MAGIC | RT_MEMHEAP_USED));
     /* check whether this block of memory has been over-written. */
     RT_ASSERT((header_ptr->next->magic & RT_MEMHEAP_MASK) == RT_MEMHEAP_MAGIC);
 
@@ -533,9 +575,9 @@ void rt_memheap_free(void *ptr)
     }
 
     /* Mark the memory as available. */
-    header_ptr->magic &= ~RT_MEMHEAP_USED;
+    header_ptr->magic = (RT_MEMHEAP_MAGIC | RT_MEMHEAP_FREED);
     /* Adjust the available number of bytes. */
-    heap->available_size = heap->available_size + MEMITEM_SIZE(header_ptr);
+    heap->available_size += MEMITEM_SIZE(header_ptr);
 
     /* Determine if the block can be merged with the previous neighbor. */
     if (!RT_MEMHEAP_IS_USED(header_ptr->prev))
@@ -544,7 +586,7 @@ void rt_memheap_free(void *ptr)
                                         header_ptr->prev));
 
         /* adjust the available number of bytes. */
-        heap->available_size = heap->available_size + RT_MEMHEAP_SIZE;
+        heap->available_size += RT_MEMHEAP_SIZE;
 
         /* yes, merge block with previous neighbor. */
         (header_ptr->prev)->next = header_ptr->next;
@@ -560,7 +602,7 @@ void rt_memheap_free(void *ptr)
     if (!RT_MEMHEAP_IS_USED(header_ptr->next))
     {
         /* adjust the available number of bytes. */
-        heap->available_size = heap->available_size + RT_MEMHEAP_SIZE;
+        heap->available_size += RT_MEMHEAP_SIZE;
 
         /* merge block with next neighbor. */
         new_ptr = header_ptr->next;
@@ -595,6 +637,91 @@ void rt_memheap_free(void *ptr)
 }
 RTM_EXPORT(rt_memheap_free);
 
+#ifdef RT_USING_FINSH
+static void _memheap_dump_tag(struct rt_memheap_item* item)
+{
+    rt_uint8_t name[2 * sizeof(void*)];
+    rt_uint8_t* ptr;
+
+    ptr = (rt_uint8_t*)&(item->next_free);
+    rt_memcpy(name, ptr, sizeof(void*));
+    ptr = (rt_uint8_t*)&(item->prev_free);
+    rt_memcpy(&name[sizeof(void*)], ptr, sizeof(void*));
+
+    rt_kprintf("%.*s", 2 * sizeof(void*), name);
+}
+
+int rt_memheap_dump(struct rt_memheap *heap)
+{
+    struct rt_memheap_item *item, *end;
+
+    if (heap == RT_NULL) return 0;
+    RT_ASSERT(rt_object_get_type(&heap->parent) == RT_Object_Class_MemHeap);
+
+    rt_kprintf("\n[%.*s] [0x%08x - 0x%08x]->\n", RT_NAME_MAX, heap->parent.name, 
+        (rt_ubase_t)heap->start_addr, (rt_ubase_t)heap->start_addr + heap->pool_size);
+    rt_kprintf("------------------------------\n");
+
+    /* lock memheap */
+    rt_sem_take(&(heap->lock), RT_WAITING_FOREVER);
+    item = heap->block_list;
+
+    end = (struct rt_memheap_item *) ((rt_uint8_t *)heap->start_addr + heap->pool_size - RT_MEMHEAP_SIZE);
+
+    /* for each memory block */
+    while ((rt_ubase_t)item < ((rt_ubase_t)end))
+    {
+        if (RT_MEMHEAP_IS_USED(item) && ((item->magic & RT_MEMHEAP_MASK) != RT_MEMHEAP_MAGIC))
+            rt_kprintf("0x%08x", item + 1);
+
+        if (item->magic == (RT_MEMHEAP_MAGIC | RT_MEMHEAP_USED))
+        {
+            rt_kprintf("0x%08x: %-8d ",     item + 1, MEMITEM_SIZE(item));
+            _memheap_dump_tag(item);
+            rt_kprintf("\n");
+        }
+        else
+        {
+            rt_kprintf("0x%08x: %-8d <F>\n", item + 1, MEMITEM_SIZE(item));
+        }
+
+        item = item->next;
+    }
+    rt_sem_release(&(heap->lock));
+
+    return 0;
+}
+
+int memtrace(void)
+{
+    int count = rt_object_get_length(RT_Object_Class_MemHeap);
+    struct rt_memheap **heaps;
+
+    if (count > 0)
+    {
+        int index;
+        extern int list_memheap(void);
+
+        heaps = (struct rt_memheap**)rt_malloc(sizeof(struct rt_memheap*) * count);
+        if (heaps == RT_NULL) return 0;
+
+        list_memheap();
+
+        rt_kprintf("memheap header size: %d\n", RT_MEMHEAP_SIZE);
+        count = rt_object_get_pointers(RT_Object_Class_MemHeap, (rt_object_t*)heaps, count);
+        for (index = 0; index < count; index++)
+        {
+            rt_memheap_dump(heaps[index]);
+        }
+
+        rt_free(heaps);
+    }
+
+    return 0;
+}
+MSH_CMD_EXPORT(memtrace, dump memory trace information);
+#endif
+
 #ifdef RT_USING_MEMHEAP_AS_HEAP
 static struct rt_memheap _heap;
 
@@ -643,6 +770,24 @@ void *rt_malloc(rt_size_t size)
         }
     }
 
+
+#ifdef RT_USING_MEMTRACE
+    if (ptr == RT_NULL)
+    {
+        RT_DEBUG_LOG("malloc[%d] => NULL", size);
+    }
+    else
+    {
+        struct rt_memheap_item *item = MEMITEM(ptr);
+        if (rt_thread_self())
+            rt_memheap_setname(item, rt_thread_self()->name);
+        else
+            rt_memheap_setname(item, "<null>");
+
+        RT_DEBUG_LOG("malloc => 0x%08x : %d", ptr, size);
+    }
+#endif
+
     return ptr;
 }
 RTM_EXPORT(rt_malloc);
@@ -691,6 +836,23 @@ void *rt_realloc(void *rmem, rt_size_t newsize)
         }
     }
 
+#ifdef RT_USING_MEMTRACE
+    if (new_ptr == RT_NULL)
+    {
+        RT_DEBUG_LOG("realloc[%d] => NULL", newsize);
+    }
+    else
+    {
+        struct rt_memheap_item *item = MEMITEM(new_ptr);
+        if (rt_thread_self())
+            rt_memheap_setname(item, rt_thread_self()->name);
+        else
+            rt_memheap_setname(item, "<null>");
+
+        RT_DEBUG_LOG("realloc => 0x%08x : %d", new_ptr, newsize);
+    }
+#endif
+
     return new_ptr;
 }
 RTM_EXPORT(rt_realloc);
@@ -708,6 +870,17 @@ void *rt_calloc(rt_size_t count, rt_size_t size)
         rt_memset(ptr, 0, total_size);
     }
 
+#ifdef RT_USING_MEMTRACE
+    if (ptr == RT_NULL)
+    {
+        RT_DEBUG_LOG("calloc[%d x %d] => NULL", count, size);
+    }
+    else
+    {
+        RT_DEBUG_LOG("calloc => 0x%08x : %d", ptr, count * size);
+    }
+#endif
+
     return ptr;
 }
 RTM_EXPORT(rt_calloc);