In addition to what Dreymar posted you could also use the more general purpose input device driver ControllerMate.

It allows you to remap key codes, among many other things. I used that feature while testing a TrulyErgonomic keyboard, which does have some keys in unusual locations - for example the Shift keys are a row higher up than on other keyboards, and by default there is no Command key to be operated by the thumb.

ControllerMate allowed me to make some adjustments.

Note that it requires you to be logged in, as the remappings are per user - in the login screen, your personal configuration won't take effect.

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To enter Chinese maybe a keyboard layout editor such as Ukelele is more up to the task. I used Ukelele to move a few letters in the Colemak Alt/Option layer. Note I'm not familiar with Chinese text input, and a quick search resulted in utter confusion, so take this with a grain of salt. ;)