The excel doesn't show chinese characters
We recently had a similar issue with all Asian fonts in Excel for OSX (Chinese, Japanese, and Korean).  The solution that worked for us was to change the font to "Arial Unicode MS".  You can do it for just the cells in question or the entire sheet.

Answer originally found from the question chain here:
https://discussions.apple.com/thread/3456247?start=0&amp;tstart=0