Well, there's two sides to this. As somebody living in China, it's actually quite easy - localbitcoins. Can get it sent straight to your Alipay (for the sake of this comment - like paypal). I've done it to order pizza and stuff for proof of concept.

That being said, Chinese citizens are forced to register their ID to any of these websites (many of the big ones simply don't allow or have a separate, chinese-version of their website), removing any anonymity and security-from-government. The best way to get around this is to get somebody like me - a non chinese living in china - to do it with their home country ID