Traveling to beijing 17 Dec to 23 dec 2016. kindly advise on the clothing to bring.

It may be sunny, and snow slightly sometimes during that period of time. The temperature may range from 25F to 40F. It would be quite cold.
You are advised to take down jackets, sweaters, warm pants, and winter shoes to hike the Great Wall.
I am afraid that normal sports shoes are not suitable. Keep warm and have fun! :)