diff --git a/components/drivers/include/drivers/usb_common.h b/components/drivers/include/drivers/usb_common.h
index 866909f3a71e1d0e988595a0995d4bb69cd3deb4..08462d9244891139f5a3e7794ecd48063cc271fa 100644
--- a/components/drivers/include/drivers/usb_common.h
+++ b/components/drivers/include/drivers/usb_common.h
@@ -21,6 +21,7 @@
  * Date           Author       Notes
  * 2012-10-01     Yi Qiu       first version
  * 2013-04-26     aozima       add DEVICEQUALIFIER support.
+ * 2017-11-15     ZYH          fix ep0 transform error
  */
 
 #ifndef __USB_COMMON_H__
@@ -241,6 +242,16 @@ typedef enum
     USB_STATE_SUSPENDED
 }udevice_state_t;
 
+typedef enum
+{
+    STAGE_IDLE,
+    STAGE_SETUP,
+    STAGE_STATUS_IN,
+    STAGE_STATUS_OUT,
+    STAGE_DIN,
+    STAGE_DOUT
+} uep0_stage_t;
+
 #pragma pack(1)
 
 struct usb_descriptor
diff --git a/components/drivers/include/drivers/usb_device.h b/components/drivers/include/drivers/usb_device.h
index fbbae7edb918827bd4c6c1db823b05c52f4816c2..5e2417e90da66b12c75512209a5eaecf2132bba7 100644
--- a/components/drivers/include/drivers/usb_device.h
+++ b/components/drivers/include/drivers/usb_device.h
@@ -22,6 +22,7 @@
  * 2012-10-01     Yi Qiu       first version
  * 2012-12-12     heyuanjie87  change endpoint and function handler
  * 2013-04-26     aozima       add DEVICEQUALIFIER support.
+ * 2017-11-15     ZYH          fix ep0 transform error
  */
 
 #ifndef  __USB_DEVICE_H__
@@ -137,6 +138,7 @@ struct udcd
     struct rt_device parent;
     const struct udcd_ops* ops;
     struct uendpoint ep0;
+    uep0_stage_t stage;
     struct ep_id* ep_pool;
 };
 typedef struct udcd* udcd_t;
diff --git a/components/drivers/usb/usbdevice/core/core.c b/components/drivers/usb/usbdevice/core/core.c
index 6880f931f009b8d55993ac94b101771b8b8f174c..a3caa60f99951fb71883f2ae5a1b6ffe3c88ec9a 100644
--- a/components/drivers/usb/usbdevice/core/core.c
+++ b/components/drivers/usb/usbdevice/core/core.c
@@ -24,6 +24,7 @@
  * 2012-12-30     heyuanjie87  change inferface handler
  * 2013-04-26     aozima       add DEVICEQUALIFIER support.
  * 2013-07-25     Yi Qiu       update for USB CV test
+ * 2017-11-15     ZYH          fix ep0 transform error
  */
 
 #include <rtthread.h>
@@ -1815,22 +1816,41 @@ rt_err_t rt_usbd_ep0_setup_handler(udcd_t dcd, struct urequest* setup)
 
 rt_err_t rt_usbd_ep0_in_handler(udcd_t dcd)
 {
+    rt_int32_t remain, mps;
+
     RT_ASSERT(dcd != RT_NULL);
 
-    if(dcd->ep0.request.remain_size >= dcd->ep0.id->maxpacket)
-    {
-        dcd_ep_write(dcd, EP0_IN_ADDR, dcd->ep0.request.buffer, dcd->ep0.id->maxpacket);
-        dcd->ep0.request.remain_size -= dcd->ep0.id->maxpacket;
-        dcd->ep0.request.buffer += dcd->ep0.id->maxpacket;
-    }
-    else if(dcd->ep0.request.remain_size > 0)
+    if (dcd->stage != STAGE_DIN)
+        return RT_EOK;
+
+    mps = dcd->ep0.id->maxpacket;
+    dcd->ep0.request.remain_size -= mps;
+    remain = dcd->ep0.request.remain_size;
+
+    if (remain > 0)
     {
-        dcd_ep_write(dcd, EP0_IN_ADDR, dcd->ep0.request.buffer, dcd->ep0.request.remain_size);
-        dcd->ep0.request.remain_size = 0;
+        if (remain >= mps)
+        {
+            remain = mps;
+        }
+
+        dcd->ep0.request.buffer += mps;
+        dcd_ep_write(dcd, EP0_IN_ADDR, dcd->ep0.request.buffer, remain);
     }
     else
     {
-        dcd_ep_write(dcd, EP0_IN_ADDR, RT_NULL, 0);
+        /* last packet is MPS multiple, so send ZLP packet */
+        if ((remain == 0) && (dcd->ep0.request.size > 0))
+        {
+            dcd->ep0.request.size = 0;
+            dcd_ep_write(dcd, EP0_IN_ADDR, RT_NULL, 0);
+        }
+        else
+        {
+            /* receive status */
+            dcd->stage = STAGE_STATUS_OUT;
+            dcd_ep_read_prepare(dcd, EP0_OUT_ADDR, RT_NULL, 0);
+        }
     }
 
     return RT_EOK;
@@ -1935,6 +1955,7 @@ rt_err_t rt_usbd_sof_handler(udcd_t dcd)
 rt_size_t rt_usbd_ep0_write(udevice_t device, void *buffer, rt_size_t size)
 {
     uep_t ep0;
+    rt_size_t sent_size = 0;
 
     RT_ASSERT(device != RT_NULL);    
     RT_ASSERT(device->dcd != RT_NULL);
@@ -1945,20 +1966,17 @@ rt_size_t rt_usbd_ep0_write(udevice_t device, void *buffer, rt_size_t size)
     ep0->request.size = size;
     ep0->request.buffer = buffer;
     ep0->request.remain_size = size;
-
-    if(ep0->request.remain_size >= ep0->id->maxpacket)
+    if(size >= ep0->id->maxpacket)
     {
-        dcd_ep_write(device->dcd, EP0_IN_ADDR, ep0->request.buffer, ep0->id->maxpacket);
-        ep0->request.remain_size -= ep0->id->maxpacket;
-        ep0->request.buffer += ep0->id->maxpacket;
+        sent_size = ep0->id->maxpacket;
     }
     else
     {
-        dcd_ep_write(device->dcd, EP0_IN_ADDR, ep0->request.buffer, ep0->request.remain_size);
-        ep0->request.remain_size = 0;
+        sent_size = size;
     }
+    device->dcd->stage = STAGE_DIN;
 
-    return size;
+    return dcd_ep_write(device->dcd, EP0_IN_ADDR, ep0->request.buffer, sent_size);
 }
 
 rt_size_t rt_usbd_ep0_read(udevice_t device, void *buffer, rt_size_t size, 
@@ -1975,6 +1993,7 @@ rt_size_t rt_usbd_ep0_read(udevice_t device, void *buffer, rt_size_t size,
     ep0->request.buffer = buffer;    
     ep0->request.remain_size = size;
     ep0->rx_indicate = rx_ind;
+    device->dcd->stage = STAGE_DOUT;
     dcd_ep_read_prepare(device->dcd, EP0_OUT_ADDR, buffer, size);
 
     return size;