Step 1:
Install the fonts
aptitude install ttf-arphic-bkai00mp ttf-arphic-uming ttf-arphic-gkai00mp ttf-arphic-bsmi00lp ttf-arphic-gbsn00lp ttf-arphic-ukai xfonts-intl-chinese unifont ttf-unifont
Step 2:
Install all the scim related packages
aptitude install scim-pinyin uim-pinyin scim-uim scim-chinese scim-tables-zh
Step 3:
im-switch -c
Select scim and save.
Step 4:
Restart your session by logging out and logging in again.