How to go to Huanghuacheng great wall from Huilongguan?

Hi, Mobash. Are you going to visit there on July 2th, 2017? If so, you are suggested to take subway line 13 at Huilongguan Station to get to Dongzhimen Station and then take a Special Sightseeing Bus to this spot. This bus departs between 8:00 and 9:00 and will cost CNY80. This bus only works from April to October and takes about 3 hours to get there. Huanghuacheng will be open every day.
Have a nice trip!