Introduction to the front room: The front room of the underground palace is 8.05 meters long from north to south, 5.25 meters wide from east to west, and 4 meters high. The top is east-west. The roof of the corridor is shorter, 1.9 meters high and 1.95 meters long. There is a large vat in the middle of the front room with a diameter of 1.1 meters and a height of 1.5 meters. There is an iron core lamp holder in the vat, which is a ten thousand year lamp.