There might be some experimental aircraft association in china that can help you, but failing that try these guys to get your clearances, we use them a lot and they are great:
Jet Service China Success (JSC)
Operations Office
Tel: 8620 3618 0046
Fax: 8620 3618 0067
24 HR: 86 139 2213 9599
[email protected]
Jscchina (http://www.jscchina.com)