Analysis:

The Ming Great Wall is the site of Datong section of the ancient Great Wall. Datong is one of the nine important towns in Ming Dynasty, and its strategic position is very important.

Datong Ming Great Wall was mainly built during Jiajing period, and was built by Weng Wanda, Governor of Xuanda University. Datong mayor starts from Koutai, dongbei town, Tianzhen County in the east and ends at Yajiao Mountain in the west (now Dongshan, Zishang Village, Qingshuihe, Inner Mongolia), with a total length of 335 kilometers. According to the statistics of "Planning, Testing and Illustration of Three Clouds in General Town of Datong", Datong Town has successively built a 5 16.3-mile big side and two sides; There are 72 main castles (20 in the city and 52 in the castle), such as inner five castles, outer five castles, outer five castles and Yungang six castles; 776 side piers; There are 833 fire piers.