how to go Badlaling great wall by bus / train from Bejing Reagal hotel, wangfujjing

The closest subway station is the Dongsi Station, so you can walk to that station to take the subway line 5 to reach Yonghegong Station. Then change to 2 to Jishuitan Station. After that you can walk to the Deshengmen Bus Station to take the bus line 919 to Badaling Great Wall.

i want to know by train also from Beijing Regal Hotel, Wangfujjing and what will be the train ticket cost for Badaling Great wall

At Dongsi metro station, use subway line 6 to Chegongzhuang, where transfer to line 4 to Xizhimen. Then walk to Bejing North Train Station to take a S-train to Badaling, at the cost of CNY6 per person.