What time is the last trip from Beijing Badaling great wall to de sheng bus terminal?

Hi, The last bus from Badaling Great Wall to Deshengmen departs at 17:00. It stops near the pulley at the front mountain of Badaling.

Thank you for your reply. Regarding Bus 919, How do we know its the Express Non-stop bus to Badaling Great Wall considering that there may be many 919 buses to Badaling great Wall. Again, Thank you so much.

The bus station is set at the back of the Deshengmen Tower. Always, there is a long line so you could recognize the right bus easily. I found this website has words with pictures on the Badaling Travel Tips(https://www.travelchinaguide.com/cityguides/beijing/greatwall.htm) . There is one photo of the right bus station board and useful tips.
Ps: don't trust these people who would like you to take his/her bus. The bus fare of the right 919 could be paid by Beijing Transportation Card.

Thank you Mr Shan for replying. I appreciate it very much.