See this: https://www.travelchinaguide.com/cityguides/beijing/dinning/fastfood.htm

where in Beijing would you be staying??? You would find a KFC/Mc D almost everywhere, aur meat bhi halal rehta hai.. I know it coz I had a Muslim frnd along with me the last time I visited Beijing, and he used to make sure whatever he has is Halal... Otherwise, there're a lot of good Muslim restaurants around Nui Ji Mosque.. do check them out..