Hi Tony,

Thanks for your nice suggestion. If I couldn't find the way to disable
Ribbon, FullScreen will be at least the last best choice.

If I run ActiveDocument.ActiveWindow.View.FullScreen = True using VBA, it is
working well.
But when I tried to automating word in C++.It failed. My code is shown as
follow:

  MSWORD::_Document oDoc = GetHtmlDocument();//Get the handle from
CHtmlView.
     oDoc.Activate();
     MSWORD::Window oActiveWnd = oDoc.GetActiveWindow();
     oActiveWnd.Activate();
     MSWORD::View  oView = oActiveWnd.GetView();
     BOOL bFullScreen = oView.GetFullScreen();     //Here get the value
bFullScreen = false.

     oView.SetFullScreen(TRUE);                              //Will cause
exception!!

     oView.SetReadingLayout(TRUE);                       //Successful to
set into Reading Layout mode, but the Ribbon still exist.

Does anybody knows why? Thanks.

Thank you Howard, It's a good idea. I could hook the handle of ribbon and
hide it.
But I am unable to minimize the ribbon area by using MoveWindow() of
SetWindowPos().
So it remains a white rectangle in ribbon area:(

Here is the code:
   CFindWnd fwndRibbon(this->GetSafeHwnd(),_T("NetUIHWND"));
   CWnd *pWndRibbon = CWnd::FromHandle(fwndRibbon.m_hWnd);
   if( pWndRibbon)
   {
     m_pWndRibbon->ShowWindow(SW_HIDE);     //Could hide the ribbon.
    // m_pWndRibbon->MoveWindow(0,0,1,1,TRUE);// I Hope to minimize it into
a point, but failed.
    // m_pWndRibbon->SetWindowPos(NULL,0,0,1,1,SWP_HIDEWINDOW);
   }