The Great Wall is a treasure of Chinese civilization, one of the world cultural heritages, a building as famous as the Egyptian pyramids, and a miracle of mankind. More than two thousand years ago, the Great Wall of Wan Li was built with the flesh and blood of working people. The Great Wall is the crystallization of the wisdom of the ancient people in China and a symbol of the Chinese nation. During the Spring and Autumn Period and the Warring States Period, governors of various countries built beacon towers to defend against foreign invasion and connected them with city walls. The earliest Great Wall was formed. After that, almost all emperors reinforced and built the Great Wall. Because it is tens of thousands of Li Long, it is also called the Great Wall of Wan Li. According to records, Qin Shihuang used nearly one million laborers to build the Great Wall, accounting for one twentieth of the national population. But at that time, there was no machinery, and all the labor depended on manpower, and the working environment was very difficult. The Great Wall starts from Shanhaiguan in the east and ends at Jiayuguan in Gansu in the west. East to Yalu River, passing through 10 provinces, autonomous regions and municipalities from east to west. The total length of the Great Wall is 885 1.842km, of which the artificial Great Wall is 6259.662km, and the trench and natural formation are 2592.265km.