When you come to Ningshou Palace, you must pass the Huangjimen first, which is opposite the Kowloon Wall. The Huangjimen is special in all the gates of the Forbidden City. The first is that it is a building with a door and a wall, known as a wall door. Second, the imperial gate is three seven-floor hanging flower door-style glass archway doors, three door holes covered with yellow glazed tiles single-paneled palace roof, its bucket arch, lotus column and other components are also glazed, from the appearance of each door hole like a small door building. The shape of the imperial gate is unique in the shape of the Forbidden City, and the shape is exquisite.