I am staying at Beijing Novotel Xin Qiao. How do I get to mutianyu great wall from my hotel?

From this hotel, you could take city-bus or subay to get to Dongzhimen station firstly and then transfer to Mutianyu Great Wall by bus 867 or 916. The detailed itinerary could be found on this page: https://www.travelchinaguide.com/china_great_wall/scene/beijing/mutianyu.htm