information about Q2 visa

Yes, it's possible to extend your Q2 after you enter China. You can do this at the local exit and entry administration office by presenting your passport, application form, recent bare-headed photo, marriage certificate and your wife's ID card. However, based on my knowledge, you can only extend the Q2 twice. If you want to stay longer, you can see whether the Q2 type can be converted to Q1 without leaving China.