i need to know whether safe or not to travel to beijing alone (independent travel)?

It is generally safe to travel to Beijing alone. It is very easy to find halal food in Beijing. I would like to recommend some nice halal food restaurants to you:
Donglaishun Muslim Restaurant: 5/F, Xindongan Mansion, No.138, Wangfujing Dajie, Dongcheng District
Dingshenglou Muslim Restaurant: No.15, Zhengfu Jie, Changping District
Jubaoyuan: No.5-2, Bldg. 1, Xi Niujie Li, Xuanwu District