Simatai Great Wall is located in the north of Simatai Village, Gubeikou Town, north of Miyun District, northeast of Beijing, close to Gubei Water Town, 120 kilometers from Beijing, belonging to the Yanshan Mountains, Simatai Great Wall is built on the steep mountain, and is known for its five characteristics of danger, dense, Qi, Qi, Qi and all. The Simatai Great Wall rises from Wangjing Building to the east, and from the west to Houchuankou. The length of the Great Wall is5.7 kilometers. Among them, Wuhu Reservoir divides the Great Wall into two sections. There are 16 enemy buildings in the east and 19 enemy buildings in the west, with a total of 35 (including one in the water that has been destroyed). In 1987, the Simatai Great Wall was listed on the World Heritage List, and is the only ancient architectural site in China that retains the original appearance of the Ming Dynasty, and is designated by UNESCO as the "Original Great Wall". Luo Zhewen, a famous ancient architect in China, once said that "the Great Wall of China is the world's most, and the Great Wall of Simatai is the most". In 2012, the Great Wall of Simatai was named "the top 25 scenery in the world that cannot be missed" by the British Times. The Simatai Great Wall was built in the early years of Ming Hongwu (AD 1373), and was built on the basis of the Great Wall of Beiqi, under the jurisdiction of the ancient north road of Zhongmu Town of the Ming Dynasty "Jiuzhen". During the Ming Wanli period, Qi Jiguang, the general soldier of Jingyu Town, and the governor, Yuan led the troops to carry out key renovations, greatly improving the defense system. Its mountain is steep, the terrain is steep, the project is vast, easy to guard, and the wind speed is large.