To whom it may concerns, Many of us are using Microsoft PinYin Input Method to input Chinese in Windows System. However, its font size in emacs is too small to be seen while VIM doesn't have this issue. With the help of emacser from Emacs China, it seems that the cause is that the im font size is fixed in emacs while VIM has code to deal with it (https://github.com/vim/vim/blob/124371c5a149a8c0c75c04b6c90ac11e71a0aa97/src/gui_w32.c#L5862-L5875). You could check the attached screenshots, where the size of "ce'shi" is the issue. Please help check and fix it, thx! All the best, Feng