Passport and Chinese visa

I am planning to travel from Seattle, Washington to Beijing China in late April 2016. I currently have a 10 year multiple entry tourist L type for PRC which expires in 2025. The USA passport that has the L type on it expired in 2015. I applied and received a new USA passport.
Do I bring the old passport that has my L type, along with my new passport, to the Seattle airport when I fly to PRC?
Thank you for your assistance in this matter.
Inge Hart