The ancient city of Heishantou is located on the eastern marsh platform at the entrance of the Genhe River and Deerbull River into the Erguna River. The outer city is square, with a circumference of 2.35 kilometers, covering an area of 346290 square meters, and the wall is1-2 meters high, and the highest is more than 4 meters; The top of the wall is 2 meters wide, the bottom is 6 meters wide, there is a moat outside the city wall, the bottom is5-9 meters wide, the depth is1-2 meters, there are city gates on all sides, the door is9-12 meters wide, the door is set outside the city wall, there is a horse face every 100 meters outside the city wall, there is a tall corner tower at the corner of the city wall prominent outside the wall wall; The inner city is in the middle of the outer city west and north position, rectangular, 560 meters perimeter, covering an area of 18871 square meters, there are two small gates in the east and west, there are also cockroaches outside the city, the whole building is "dry" shape, the granite round columns in the site are arranged in an orderly manner, the spacing is 4 meters, the site is glazed tiles, blue bricks, Dragon-printed tiles and green fin raspberry fragments are everywhere.