自古中国史上的外患,要者常在北方,其中尤以匈奴为最。而匈奴与中原王朝之往来亦横亘秦汉两朝之久。其中,西汉与匈奴的军事关系较之秦帝国,则更加繁复多变。本文注目于西汉与匈奴的军事关系及其往来情况,在此基础上考察汉廷民族政策之得失,以求有裨益于当下。 Since the ancient Chinese history of foreign aggression, who often in the north, especially the Huns most. The Huns and the Central Plains dynasty also traversed the Qin and Han Dynasties for a long time. Among them, the Western Han Dynasty and the Huns military relations than the Qin Empire, the more complex and changeable. This article focuses on the military relations and their contacts between the Western Han Dynasty and the Huns, and on the basis of this, examines the pros and cons of the ethnic policies of the Han court in order to benefit the present.