Introduction&bsp& nbsp; Located about 40 kilometers southwest of Ruoqiang County, on the mountaintop south of a steep cliff with an altitude of about 3000 meters, there is only one small path about 500 meters long that leads to the castle along the natural direction of the ridge. The cliffs on both sides of the mountain ridge are about 100 meters deep, with natural landscapes such as eagle beak stones and a line of sky on both sides. Strange rocks stand tall, with interlocking teeth, and the terrain is very steep, resembling a situation where one man is in charge and ten thousand men are unable to leave. The mountain top has been manually flattened, surrounded by a stone wall with a circumference of 300 meters. A city gate is connected to a small path passing through the ridge to the north. There are still circular stone walls in the west of the castle, with a remaining height of about 3 meters and a thickness of about 2 meters, containing brick and stone structures. There are a large number of iron smelting slag, fragments of tongs and pots, and gray brown square bricks scattered on the ground inside the castle. The intact square bricks are 44 × 23 × 6.5 centimeters. A charcoal culture layer with a thickness of about 2 meters was also found at the cross-section of the surface. The entire castle has a "┻" shape on its exterior