By bus: take bus no. 944 branch line from Huguang Middle Street to Wangjing subway station, then take Beijing Subway(https://www.travelchinaguide.com/cityguides/beijing/transportation/subway.htm) ,line 13 to Dongzhimen, get off and change to line 2 to Jishuitan. Then walk to Deshengmen to take bus no. 919 express line or through line to Badaling.

By train: The same with the itinerary above, but you need to get off at Xizhimen of Subway line 2. then walk to Beijing North Railway Station to take a train (Y567 at 0933 and Y575 at 1319) to Badaling.