salam, im staying in Novotel Beijing Xin Qiao,where is the nearest halal food and mosque?

The closest halal food restaurant is the Xi Yu Ke (西域客) at 4F of SosShow at No. 40, Chongwenmen Wai Street.
From your hotel, you can walk along the Chongwenmen Wai Street to that Sos Show directly.
The closest mosque is the Huashi Mosque at 80, Huashi Avenue.
You can walk along the Chongwenmen Wai Street to Huashi Avenue easily and then walk along that street to the mosque.