西汉长城(包括修缮利用故塞的部分和西汉新筑的部分)一共二万余里,西极新疆,东至朝鲜,北达外蒙,是历代长城中最长的。是在汉匈战争期间,随着汉朝势力的发展及汉朝与匈奴斗争形势的需要,对前代长城加以修缮或者新建而成的。西汉时期使用的长城,按照其始建年代,可分为故塞和新边两种。从秦末汉初,历经了高祖、吕后、文帝、景帝,直到武帝元鼎六年(公元前111年)之前主要利用 The Great Wall of the Western Han Dynasty (including the section of repairing and using the plug and the new part of the Western Han Dynasty) totaled more than 20,000 miles. The western part of Xinjiang, the east of North Korea and the north of Inner Mongolia are the longest in the Great Wall. During the Han-Hun War, with the development of the forces of the Han Dynasty and the need of the situation of the struggle between the Han Dynasty and the Xiongnu, the Great Wall was restored or newly built. The Great Wall used in the Western Han Dynasty, according to its founding years, can be divided into two kinds of plug and the new side. From the late Qin Dynasty to the early Han Dynasty, after the emperor, Lu, the emperor, King emperor until the emperor Yuan Ding six years (111 BC) before the main use