How can we get to silk market from marriott city wall hotel?

The best way is take a taxi from your hotel to the silk market directly, since it is not far away from your hotel to the market. There is about 4 kilometers between them.
There is another way to go to the silk market. You can first go to the subway station of Beijing Railway Station and then take the subway line 2 to arrive at Jianguomen station. After that, you need to transfer to line 1 to stop at Yonganli. Exit from Exit A and you can see it.