I currently have a Chinese business M type that expires in Jul 2018,

however my passport expires in April 2017. Is there a minimum requirement of time to be left on your passport before entering Beijing (i.e. 6 months) even if you are leaving China in advance of passport expiration? I'm planning to go in January 2017.

Also when i renew my passport, do i need to get a new chinese visa or can I show my valid visa in my expired passport, when entering on my new passport?