Abstract: The Tongcheng County was built in the ninth year of Daye in Sui Dynasty(613). In the fourth year of Wanli in Ming Dynasty(1576), it was rebuilt into a brick city on the site of Sui Dynasty. The county has a history of more than 1,400 years. The outer part of the county has two-layer city defense system with the mountain and water barrier and the artificial defense facilities. The internal layout of the county town is both a product of the dual influence of Guanzi's idea of city planning based on local conditions and the ancient concept of creating resembling objects, and a typical example of incorporating the ancient system of capital city planning into local city planning, focusing on the city's military defense and political edification functions. At the same time, it also provides inspiration for modern urban planning.

Key words: Ming Dynasty, Tongcheng county, city defense construction, planning and layout, urban planning ideas