The concept of IP rights doesn't really exist in Chinese business culture. Your source code or any other proprietary technology is fair game.

I know startup founders that have raised Chinese money and not regretted it, but it's important that it be "dumb money", i.e. they give you cash and go away while you write an occasional investor update and grow the business. Active Chinese investors (i.e. anything where you give up board seats, decision-making power, strategic partnerships, etc.) are bad news. You want to be in a position where if your investors ask you for something you can just ignore them.