Introduction to the vestibule: The west end of the corridor is connected to the front room (according to the inscriptions on the stone on the corridor, the front room is the East Palace). The front room is rectangular in plan, 9.15-9.25 meters long from east to west, 5.05-5.18 meters wide from north to south, and 2.7-2.75 meters high. , there are 6 small side rooms on the north and south walls of the front room, and there are rectangular pits cut into the bottom of the front room.