You can choose from major insurances companies such as AXA, AIA and AIG. It is usually best to contact the insurance companies directly in order to get quotations and plans. The easiest way to contact them is via their websites such as:
 
AIA
www.aia-ins.com.cn
 
AIG
www.aig.com.cn
 
AXA
www.axa-ins.com.cn