The current situation regarding travel restrictions in China is fluid at the moment, as restrictions are often modified at the local level based on the current risk situation, affected by recent Covid outbreaks.
Personally, I would check the Website for the airport I would be landing on my entry into China (not my final destination if taking an internal connecting flight). I would also check the airline's Website. Bear in mind that travel restrictions could change while you are in the air. I would definitely get a Covid test and printed result the day before I flew.