about w3m view chinese fonts

[step <fxlzju@gmail.com>]

 hi
 i intall w3m,it work well in the xterm to show chinese fonts,but it
can't work in the emacs,i set in .emacs,but it seem don't work too

(setq w3m-coding-system 'utf-8
          w3m-file-coding-system 'utf-8
          w3m-file-name-coding-system 'utf-8
          w3m-input-coding-system 'utf-8
          w3m-output-coding-system 'utf-8
          w3m-terminal-coding-system 'utf-8
	  w3m-bookmark-file-coding-system 'utf-8
	  w3m-default-url-coding-system 'utf-8
	  w3m-arrived-file-coding-system 'utf-8
	  w3m-default-coding-system 'utf-8)
if i change utf-8 to gb2312 ,it also can't work
 my loacle is
  LANG=zh_CN.UTF-8
LANGUAGE=zh_CN:zh
LC_CTYPE="zh_CN.UTF-8"
LC_NUMERIC="zh_CN.UTF-8"
LC_TIME="zh_CN.UTF-8"
LC_COLLATE="zh_CN.UTF-8"
LC_MONETARY="zh_CN.UTF-8"
LC_MESSAGES="zh_CN.UTF-8"
LC_PAPER="zh_CN.UTF-8"
LC_NAME="zh_CN.UTF-8"
LC_ADDRESS="zh_CN.UTF-8"
LC_TELEPHONE="zh_CN.UTF-8"
LC_MEASUREMENT="zh_CN.UTF-8"
LC_IDENTIFICATION="zh_CN.UTF-8"
LC_ALL=

how can i do? 3x!