Welcome to the FAQ website covering document topics in Canada.
My current passport is valid until February 2017. I want to come back to Canada in Oct 2015 to get a new China visa. But I won’t have enough pages in my passport to cover all the entrance and exit stamps to cover the 2 1/2 year period. Can I apply for a new passport early, even if my passport isn’t technically full yet?
You can apply for a new passport as of February 2016 or when your passport is full and there are no more empty passport pages. Only one or the other. You cannot apply before this happens. You will be able to replace your passport from China.