Your problems are pretty hard to identify, involving xelatex, begin/end CJK, and the preamble setting as well. Considering all that, it is better to re-direct you to try this cnwritingstyle, downloadable from the following link http://sdrv.ms/WSmRuu It may not be perfect to all, since still under constant review. YES, it is FREE for personal use, but not liable for any damages resulted from using it. Nevertheless, it certainly gives a direction to those who need. Tonight, wish becoming a TeXnician in the years to come.