How can I get to the badaling and mutianyu from beijing's olympic stadium?

If you would like to take the public bus, suggest you go to the starting station of the direct bus. 919 bus at Deshengmen Arrow Gate runs to Great Wall. 936 bus runs from Dongzhimen Waixiejie (within walking distance from Dongzhimen Subway Station) to Mutianyu. The direct 936 bus to Mutianyu is available at 7:00, 8:30 in the morning. Other bus get to Huairou and you have to change another bus to Mutianyu.