Research on Fort of Chinese Ancient Military Defense System

Fort defense was always being with external or internal strife in ancient China. According to the different characters and functions, the forts in military defense system are classified as five types: the administrative and military central fort, common garrison fort, fort of strategic pass, fort for transmitting information, and farming fort for military supplies. And the fort network system structure for military defense and the basic construction characters of fort are summarized. It is clarified that all kinds of defensive nodes set by forts formed ordered depth through the interconnection in different levels, and played an important role in the history of national military defense system.