diff --git a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/mem/usb_mem.c b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/mem/usb_mem.c
index f4a220235..d6db75b04 100644
--- a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/mem/usb_mem.c
+++ b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/mem/usb_mem.c
@@ -11,6 +11,7 @@ History:
 Author: AIIT XUOS Lab
 Modification: re-develop usb_hc_malloc, usb_hc_malloc_align and usb_hc_free functions
 *************************************************/
+struct usb_mem_pool usb_mem_pool;
 
 
 void *usb_hc_malloc(size_t size){
@@ -54,13 +55,81 @@ void usb_hc_free(void* ptr){
         free(ptr);
 }
 
+int usb_mem_pool_init(){
+    int rc, count;
+    uintptr_t phy_addr, vir_addr;
 
-usb_dir_page_t usb_alloc_dir_page(int len, int flag, int headroom_len){
-    return NULL;
+    memset(&usb_mem_pool, 0, sizeof(usb_mem_pool));
+    
+    count = 0;
+    while(count < MEM_POOL_SIZE){
+        rc = naive_mmap(&vir_addr, &phy_addr, 4096, true);
+
+        if(rc != 0)
+            goto mmap_error;
+
+        usb_mem_pool.pages[count].vir_addr = vir_addr;
+        usb_mem_pool.pages[count].phy_addr = phy_addr;
+
+        count++;
+    }
+
+    return 0;
+
+mmap_error:
+    return -1;
+
+}
+
+usb_mem_page_t usb_alloc_mem_page(){
+    usb_mem_page_t selected_page;
+    int header, tail;
+
+    header = usb_mem_pool.header;
+    tail = usb_mem_pool.tail;
+
+
+/* 
+ * Check whether the memory pool is full or not.
+ */
+
+    if((tail + 1) % MEM_POOL_SIZE == header)
+        return NULL;
+
+    selected_page = &usb_mem_pool.pages[tail];
+    tail++;
+
+    if(tail == MEM_POOL_SIZE)
+        tail = 0;
+
+    usb_mem_pool.tail = tail;
+
+    return selected_page;
 }
 
 
 
-void usb_free_dir_page(usb_dir_page_t page){
+void usb_free_mem_page(usb_mem_page_t page){
+    usb_mem_page_t selected_page;
+    int header, tail;
 
+    header = usb_mem_pool.header;
+    tail = usb_mem_pool.tail;
+
+/* 
+ * Check whether the memory pool is full or not.
+ */
+    if((header + 1) % MEM_POOL_SIZE == tail)
+        return;
+
+    selected_page = &usb_mem_pool.pages[header];
+    selected_page->vir_addr = page->vir_addr;
+    selected_page->phy_addr = page->phy_addr;
+
+    header++;
+
+    if(header == MEM_POOL_SIZE)
+        header = 0;
+
+    usb_mem_pool.header = header;
 }
\ No newline at end of file
diff --git a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/mem/usb_mem.h b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/mem/usb_mem.h
index 5be052e2d..a6d593160 100644
--- a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/mem/usb_mem.h
+++ b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/mem/usb_mem.h
@@ -26,9 +26,13 @@ Modification: Use usb_malloc, usb_free and usb_align functions
 #include <stdint.h>
 #include <string.h>
 #include "usb_config.h"
+#include "usyscall.h"
+
 
 #define USB_MEM_ALIGNX __attribute__((aligned(CONFIG_USB_ALIGN_SIZE)))
 
+#define MEM_POOL_SIZE 128
+
 void *usb_hc_malloc(size_t size);
 void usb_hc_free();
 void *usb_hc_malloc_align(size_t align, size_t size);
@@ -37,19 +41,25 @@ void *usb_hc_malloc_align(size_t align, size_t size);
 #define usb_free(ptr)                       usb_hc_free(ptr)
 #define usb_align(align, size)              usb_hc_malloc_align(align, size)  
 
-struct usb_dir_page{
-    uint64_t vir_addr;
-    uint64_t phy_addr;
-    uint32_t size;
-    uint32_t len;
-    uint32_t flag;
-    uint32_t headroom_len;
-}__PACKED;
+struct usb_mem_page{
+    uintptr_t vir_addr;
+    uintptr_t phy_addr;
 
-typedef struct usb_dir_page *usb_dir_page_t;
+};
 
-usb_dir_page_t usb_alloc_dir_page(int len, int flag, int headroom_len);
-void usb_free_dir_page(usb_dir_page_t page);
+struct usb_mem_pool{
+    int header;
+    int tail;
+    struct usb_mem_page pages[MEM_POOL_SIZE];
+};
+
+typedef struct usb_mem_page *usb_mem_page_t;
+typedef struct usb_mem_pool *usb_mem_pool_t;
+
+int usb_mem_pool_init();
+void usb_mem_pool_destory();
+usb_mem_page_t usb_alloc_mem_page();
+void usb_free_mem_page(usb_mem_page_t page);