Inquiry about my visa in China.

In the first place ,i wuold like to thank you for your quick and appropriate responce given to us,Iam alraedy here in china presenting demonstrations in certain high schools but my visa is expiring next month yet my schedule goes up to December,i wuold like your help in this matter before its too late for me to make necessary arrangements for getting anew visa of about six months or so.
I will be very greatfull if my request is considered.