Do I need a Visa if only Transit in China

Hi I was wondering if we need to get it as we are flying from Edinburgh (city jet airline) to Pairs (air france airline) then on to Guangzhou Baiyun Airport (CAN) transit time to wait at the airport is 2hrs wait till our flight to Brisbane then on way back it be 9hrs wait at Guangzhou Baiyun Airport (CAN).We have one for Brisbane I wasn't sure if we needed onr for China as we are only Transit .could some one let us know if we do.Thanks for your Help From Angie