Thank you for your comment. In the spirit of interpreting it in the most charitable way possible, I assume that when you say "China", you mean the Chinese government. The answer is that Chinese government doesn't necessarily represent people living in China. As you say, it is not democratic. That leaves us with few indicators of representation.

It has control over the people living in China, true, but I do not think controlling a person, being able to put them in jail if they don't obey you, is the same thing as representing them.