Visa for my husband to visit me in China

Hi, my husband(a canadian) will come to visit me(a Chinese living in Chengdu) with a 30 day single entry tourist visa. We want to change it into a family visit visa for 1 year with multiple entry. We are married for 2 years. Is it possible to do this without going out of China? How long will it take? and what is the requirements? Thank you.