how to get great wall from BJ Hutong Inn Hotel, Dongcheng District?

Which section do you want to go of Great Wall? I will just assume you wanna to go to Badaling. Walk southwards to Hepingmen Station to take subway line 2 there to Xizhimen. After getting off at exit A2, walk northwards to BJ North Station. From the north station you can take S trains to reach the Badaling Great Wall directly.