I plan to stopover at Beijing for 2 nights.

Hello! This summer I will go to USA by China Eastern Airline and be right back Thailand at the end of August. I plan to stopover at Beijing for 2 nights. At the information above, there are no mention about 72hr-visa-free for Thai.
So, Do I have to get the entry permit before going to Beijing if I want to stopover? or do you have some recommendation for me?
Thanks in advance.

sincerely