Introduction to the Patio Courtyard: Passing through the front yard is the Patio Courtyard. There are high walls around the small courtyard, which is secluded and gloomy, completely isolated from the outside world. At that time, in order to find a place to imprison Comrade Liu Shaoqi, the local garrison surveyed several places and finally determined that this was the most suitable place. It could be said that it was a truly fortified place. The first floor of the north building of Tianjingyuan is the bank vault. The second floor has a dedicated telephone line that goes directly to the center when Chairman Liu Shaoqi was "guarded". The fourth floor is the residence of the personnel who "guarded" Chairman Liu Shaoqi and the room where Chairman Liu Shaoqi died.