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The Great Wall is a military fortification in ancient China. It is a tall, solid and continuous wall to limit the movement of the enemy. The Great Wall is not a simple isolated city wall, but a defensive system with the city wall as the main body and a large number of cities, barriers, pavilions and landmarks. The history of the construction of the Great Wall can be traced back to the Western Zhou Dynasty. The famous allusion "The Beacon Fire Plays the Marquis", which took place in the capital, Haojing (today's Xi'an, Shaanxi), originated here. During the Spring and Autumn Period and the Warring States Period, the Great Wall construction entered the first climax, but the length of construction was relatively short. After Qin destroyed the six countries and unified the world, the First Emperor of Qin connected and repaired the Great Wall of the Warring States, which was called the Great Wall. The Ming Dynasty was the last dynasty to overhaul the Great Wall. Most of the Great Wall people saw was built at this time. The Great Wall resources are mainly distributed in 15 provinces, autonomous regions and municipalities directly under the Central Government, including Hebei, Beijing, Tianjin, Shanxi, Shaanxi, Gansu, Inner Mongolia, Heilongjiang, Jilin, Liaoning, Shandong, Henan, Qinghai, Ningxia and Xinjiang. It is more than 2000 kilometers long in Hebei Province and 1838 kilometers long in Shaanxi Province. According to the national survey of the Great Wall resources by the cultural relics and surveying and mapping department, the total length of the Great Wall in the Ming Dynasty is 8851.8 kilometers, and the Great Wall in the Qin and Han Dynasties and the early period is more than 10000 kilometers, with a total length of more than 21000 kilometers. The existing cultural relics of the Great Wall include the walls, trenches, boundary trenches, individual buildings, fortresses, related facilities and other relics of the Great Wall, totaling more than 43000 (pieces/section). On March 4, 1961, the Great Wall was announced by the State Council as the first batch of national key cultural relics protection units. In December 1987, the Great Wall was listed as a world cultural heritage. On November 26, 2020, the State Administration of Cultural Relics released the first batch of state-level important sites and sections of the Great Wall.