Wumen (The Meridian Gate), the gate of Forbidden City, is located at the south-north axes line of the Forbidden City. This gate is in middle place and faces sunshine directly, it is on the meridian, and hence it was named Wumen.

Duanmen (Southern End Main entrance), Tiananmen (Gate of Heavenly Peace) and Daqingmen (traditionally called Zhonghuamen in the time of Republic of China, and in 1959, it was dismantled for Tiananmen Square establishment and in 1976, on the former-base of Zhonghuamen, Chairman Mao Memorial Hall was established) are in front of it, and Taihemen (Gate of Supreme Harmony) is at back of it Wumen (The Meridian Gate) was established in 1420, and restored in 1647 and in 1801. The plane graph of Wumen (The Meridian Gate) looks like Chinese Character” 凹”,which was originated from the structure and layout of Hanyuandian of Daminggong (the imperial palace of the Tang Dynasty in Xian) and Danfengmen (Red Phoenix Gate) of Imperial Palace of the Song Dynasty. Wumen was directly changed from the gate structure of the Han Dynasty. Wumen was comprised of upper section and lower section. The lower section is the dais with 12 meters high.

In both Ming and Qing Dynasties, 24 Emperors held the ceremony in Taihedian (Hall of Supreme Harmony) such as Emperors’ enthronement ceremony, emperors’ wedding ceremony, and empress declaration ceremony and so on. Besides, each year, on the days of Longveity Festival, New Year’s Day and Winter Solstice Day, the emperor received the worshipping and greetings from thousands of officials or officers. And the emperor also represented the officials and officers the royal banquets. Moreover, the royal examinations were also held in Taihedian (Hall of Supreme Harmony). 　

Taihedian (Hall of Supreme Harmony) is the largest and highest-level architecture in Forbidden City. It is the top of Chinese ancient architecture with an incomparable status and refined decorations. Taihedian(Hall of Supreme Harmony). After experiencing a long-term history, Taihedian (Hall of Supreme Harmony) was largely restored in 2006 and until 2008.

There is a broad dais in front of Taihedian (Hall of Supreme Harmony), people usually call it Danbi or Yuetai. On the Danbi, there are sundial(日晷, an ancient time calculagraph), Jialiang (嘉量, the ancient measuring equipment), a pair of copper tortoises and a pair of copper cranes as well as 18 copper Dings(鼎, an ancient cooking utensils, later on, it became the symbol of a country or power). The base of Taihedian (Hall of Supreme Harmony) is 8.13 meters and is comprised of a three-storey white marble stones. And the surrounding of Taihedian (Hall of Supreme Harmony) is the white fence and balusters. Below the balusters, there are the stone-carved dragon heads for rainwater drainage. In rainy days, there are thousands of dragons spitting the rainwater.