Dajingmen is located in the Qiaoxi District of Zhangjiakou City, Hebei Province, and is an important pass of the Ming Great Wall. Dajingmen, along with Shanhai Pass, Jiayu Pass, and Juyong Pass, are known as the four major passes of the Great Wall, and is the only one named "Men" among the four.

Dajingmen was first built in the first year of the Shunzhi reign of the Qing Dynasty, which is in the year 1644 AD. The wall is 12 meters high, 13 meters long at the bottom, and 9 meters wide. The top platform is 12 meters long and 7.5 meters wide. There are battlements 1.7 meters high on the outside and parapets 0.8 meters high on the inside. At the lintel, there are four characters "Da Hao He Shan" handwritten by the ruler of the former province of Chahar (now Inner Mongolia) in 1927.