中国古代的城市防御体系有广义和狭义之分,其中广义指从国土领域的边防长城到单体的建筑防御体系,狭义指体现城镇本身防御功能的城墙及相关的防御体系。1狭义的中国古代的城市防御体系,除了作为主体建筑的城墙外,还由城门、城台、城楼、瓮城、角台、角楼、马面等不可或缺的组成部分,以及护城河、吊桥等环境设施构成。2学界对于秦汉时期城市防御体系的系统研究鲜见,笔者现就搜集到的涉及秦汉时 In ancient China, the urban defensive system is divided into a broad sense and a narrow sense. The broad sense refers to the building defensive system from the border town to the single unit in the territorial realm. The narrow sense refers to the city walls and the related defensive systems that reflect the defensive functions of the towns themselves. In a narrow sense, the ancient Chinese urban defensive system, in addition to being the main wall of the main building, is also an indispensable part of the city gate, the city tower, the tower, the urn city, the corner platform, the turret, the horse surface and the moat, suspension bridge, etc. Environmental facilities. 2 academics for the Qin and Han Dynasties urban defense system of the system is rare, the author now collected about the Qin and Han dynasties