Introduction to the outer area of ​​Dahongmen: Zhenghongmen is the main entrance of the mausoleum. It is a three-interval mountain-style building with a glazed roof. There are a glazed screen wall and a solid carved stone archway on both sides of the door. On the east and west sides of the door, there are four dismounting steles in five languages: Han, Manchu, Mongolian, Hui and Tibetan, two stone carved Chinese watches, and a pair of stone lions on the left and right.