I found a easy way to let FontSmoother support CJK if you are using CJKOS.
Here is how to do:
1. Disable CJKOS;
2. Disable FootSmoother in YAHM;
3. Enable FootSmoother in YAHM;
4. Enable CJKOS.
Then the CJKOS can draw CJK characters and FontSmoother also can draw anti-font characters.