I edit the command line of grub at boot time .
 I passed some parametres to kernel like below:
  
 root=/dev/sda6 video=atyfb:1024x768@60m
  
 and I also tried another one:
  
 root=/dev/sda6 video=aty128fb:1024x768@60m
  
 Both of them didn't show any error messages and the system
 can start up, but the resolution still no changed. 
  
 There is an issue happened in my buiding kernel : I hadn't found
 the driver for my video card. I'm not sure whether it has anything
 to do with this issue?
  
 BTW, my video card information is below:
  
 ATI Technologies Inc M92 LP  (ATI Radeon 4330 series)