找到了 Carbon Emacs May 05' 无法使用系统输入法的解决办法

How do I input and display Simplified Chinese characters?

To use a Simplified Chinese input method provided by Mac OS X, try

(set-language-environment 'Chinese-GB)
                (set-keyboard-coding-system 'chinese-iso-8bit)
                

in your .emacs file.

If you use May '05 edition or later, add one more line.

                (setq default-input-method "MacOSX-IM-CN")

            

关键是：

                (setq default-input-method "MacOSX-IM-CN")