thank you ,i solve it .it need change the .qrc file's properties in VS solution explorer.

command line:C:\Qt\4.5-msvc2008\bin\rcc.exe -name teach teach.qrc -o qrc_teach.cpp
description:RCC 222.qrc
outputs:qrc_teach.cpp
additional dependencies:C:\Qt\4.5-msvc2008\bin\rcc.exe;teach.qrc