Introduction to Dajing Gate: is a brick arch with a stone foundation. The door wall is 12 meters high, the bottom is 13 meters long and 9 meters wide. It has two wooden and iron doors. The top is a platform, 12 meters long and 7.5 meters wide. There are 1.7-meter-high crenels on the outside and a 0.8-meter-high parapet on the inside. On the lintel are the four characters "Great Rivers and Mountains" written by Gao Weiyue, the governor of Chahar, the local military and political leader at that time, in 1927, which is vigorous and spectacular.