what is the best route from binhai to great wall of china

You can take the high-speed train G398 or G394 directly at Binhai station, and get off at Beijng South station, which costs about 1 hour. Then can take subway line 4 to Xizhimen, get out from Exit A1 and then walk to North Railway Station to take a S2 train to reach the Badaling Great Wall. Hope it helps.