Introduction to the ancient battle road: It is 4 meters deep from the ground. It has a blue brick structure and is laid in a straight line with staggered joints up and down. The top is made of vertical bricks laid in a straight line. The construction method is consistent with the construction method in the Song and Liao Dynasties. The tunnel is 2 meters wide and 2-3 meters high, with blue bricks on the ground, water troughs and water tanks on the sides, lampstands on the walls, and ventilation holes on the top. There are Tibetan military rooms about 2 meters wide on both sides of the tunnel, with earthen kangs in the rooms. The ancient battle road extends in all directions underground and twists and turns, leading to the four gate towers of the ancient town. It was initially measured at 1,500 meters, and more than 400 meters have been discovered and restored.