As far as I know, there are two universities in Changping Shahe University Park: Beihang University (Shahe Campus) and Foreign Affairs College (Shahe Campus, officially put into use in September). These two universities are famous universities in Beijing and even the whole country, but the Shahe campus is newly built, and only some students live and study, so the resources of the library are not complete. You should be able to enter the campus. The study rooms in libraries are generally accessible, but only students in our school can borrow books.
Good luck!