Okay, I have removed my .fonts.conf and issued fontconfig-voodoo -f -s zh_CN instaed to activate Chinese fonts (this sets a symlink from /etc/fonts/language-selector.conf to /usr/share/language-selector/fontconfig/zh_CN). Still, the result is nearly the same. The only difference is that Sans-Serif is substituted with ShanHeiSun Uni now rather than ZenKai Uni. I reckon that you are under a Chinese locale. As Peng mentions in the bug report, this problem only arises when you are under a non-chinese locale!
** Attachment added: "Screenshot from Konqueror" http://librarian.launchpad.net/6992623/fonts_konqueror_zh_CN.png -- QT program doesn't select Chinese font correctly https://launchpad.net/bugs/94282 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs