This question is years old, but it has been bumped so I will chime in. My advise is don't try to trade on Chinese exchanges.
These exchanges are not charities yet they do not change a trading fee, nor any other fees to their customers. They pay their employees some salary, they pay for their hosting and internet access, and they have other misc expenses. Something is clearly wrong here, and I would suspect that customers of Chinese exchanges will eventually pay in some way.
The Chinese exchanges do charge a fiat withdrawal fee, and there is a bid-ask spread in trading.
I haven't used them though.