There are no special self-study classrooms in Tsinghua, but some classrooms almost never have classes, so many students will study there for a long time. You can see from the schedule which classrooms have no classes for a week (although there may be other activities).

If you want to find a fixed seat, you'd better go to a relatively remote teaching building, which is quiet and doesn't have to grab a seat. It is suggested that the old water conservancy museum be located in the south of Tsinghua University, and take the stairs outside the building to the next floor inside. There is hardly any activity there, but it is inconvenient. In addition, many small classrooms with six classes and zero floors, three small classrooms, four high-rise small classrooms and new water small classrooms are not convenient to arrange classes and have many opportunities to attend classes.

Also remind, don't occupy a seat for a long time, the items may be taken away, and it will be very troublesome to come back without documents.