Dear friend,
Thanks for contacting Top China Travel!
For taking bus to Mutianyu Great Wall, you could:
Public bus: Take No. 916 fast public bus, at Dongzhimen bus station(东直门), and get off at Huairou beidajie bus stop(怀柔北大街) or Huairou bus station(怀柔汽车站), then take a taxi or charter a car to Mutianyu Great Wall. No.916 fast public bus from Dongzhimen bus stop to Huairou bus station, starts at 05:50 o'clock, and every 20 minutes, and ends at 19:50, while No.916 fast public bus from Huairou bus station to Dongzhimen bus stop, starts at 4:50 o'clock, and every 20 minutes, and ends at 18:50, and the ticket fare is up to your journey distance, and the up-limit is 12 yuan for a single trip. You may take subway line 2 to Dongzhimen subway station, and then go to Dongzhimen bus station.
The bus is available everyday, and you could go to the bus station to wait for the bus before 10:00 AM.
Any further request or question, please feel free to contact with us.