Hailongtun is located in Zunyi City, Guizhou Province, about 28 kilometers northwest of the old city of Longyan Hill, also known as Hailong hoard, Longyan hoard, Longyan Tun, is a Song and Ming period of the "Tusi" castle ruins. Its administrative division belongs to the Shuanglong Group of Hailongtun Village, Gaoping Town, Huichuan District, Zunyi City.

Tun on the highest altitude of 1354 meters, Tun under the altitude of 974 meters, the relative height difference of about 300-400 meters. The top of Tuen is flat and broad, with an area of about 1.59 square kilometers. There are nine passes on the top of Tuen, six passes in front of Tuen: Tongzhu Pass, Tiezhu Pass, Feihu Pass, Feilong Pass, Chaotian Pass, Feifeng Pass; and three passes behind Tuen: Wan'an Pass, Erdao Pass, and Toudao Pass.

Expanded Information;

Hailongtun was once an important remnant of the culture of the Yang Clan Tusi of Baozhou (the ancient name of Zunyi) in the southwest of China during the Song, Yuan, and Ming Dynasties, with the Gelao and Miao populations predominating in the precincts.In 1600, the 29th generation of hereditary Tusi of Baozhou, Yang Yinglong, rebelled against the imperial court, and under a siege by a 240,000-strong Ming army for more than 100 days, the castle of Hailongtun was eventually annihilated in battle. was eventually annihilated in the flames of war.

During the Tang Dynasty, the vast area of "Broadcasting State" centered on Zunyi was occupied by the Yi people of "Nanzhao Kingdom", and in 876 A.D., the imperial court sent Yang Duan to quell the rebellion. After the matter was leveled, Yang Duan was ordered to "hereditary" broadcasting, and established the Yang's Tusi regime, which lasted for more than seven hundred years and ****29 generations.

The regime was first established, in order to "set up dangers to guard their country", and as a "solid foundation", 15 kilometers north-west of the state rule of the "Longyan Mountain" to build the "Longyan Hoard". "Longyan hoard", usually practice, wartime for administrative and military center. The end of the Southern Song Dynasty, in order to prevent "Yuan soldiers" to invade, expand and reinforce, increase the repair "horse city" "chicken city" and so on to form a system, and with the nearby "Lou Shan Pass ", "Dingshan City" to form a deep defense system. It was rebuilt during the Ming Dynasty.

Source; Baidu Encyclopedia-Hailongtun