Best option from Capital Airport to the Great Wall of China? Please?

Do you refer to Badaling Great Wall? If yes, you are suggested to take Airport Express to Dongzhimen. Change to subway line 2 to Jishuitan (Exit B2), and then walk eastward for about 600 yards (550 meters) to Deshengmen to take Bus No. 877. It is a non-stop bus, taking about an hour and costing CNY 12 per person. The drop-off site is close to the pulley car lower station and about 10 minutes' walk to the entrance.