Negotiating with Chinese Employer

I'm interested to hear your successful/failed negotiations with your Chinese employer for a contract renewal with an increase in your compensation. How did you prepare for it ? Was it in person meeting or through text ? What would you do differently if you have another chance ? I'm sure it doesn't always go your way and emoloyers around the world especially Chinese love to negotiate and bring your requests down a little bit, what would be your way out in that case ? I'm thankful to your feedback in a advance as I'm in the process of preparing myself for such situation.