can i cover the all tourist point and city and which is the central place?

If you just have two days, maybe the time will be tight.
In the first day, you can go to Forbidden City, Tiananmen Square and Wangfujing Street.
In the sceond day, Badaling Great Wall and Ming Tombs are good choice for you.
Generally speaking, the central place is Dongcheng District.

It is a two day trip so just do two days in one. DAH!