一、过所制度开始于西汉武帝太始时《汉书·匈奴传》卷下云:“明年(甘露二年)呼韩邪单于款五原塞愿朝,三年正月,汉遣车骑都尉韩昌迎,发过所七郡,郡二千骑为陈道上.”颜师古注:“所过之郡,每为发兵陈列于道,以为宠卫也.”此过所二字之始见,始用过所之制度,在古籍方面,始于宣帝时,据居延,敦煌两木简,则开始于武帝太始时期.颜师古之意,以为过所始于东汉,故对于《匈奴传》之韩昌发过所七郡,不敢解释为过所文书,仅注为所过之郡.今考过所之性质,分为两大类,一种是先发过所,人马尚未启程,等于通知形式.二 First, the system began in the Western Han Dynasty Emperor Wudi was too early, “Han Biography” roll down cloud: “next year (Manlu two years) Riding Captain Han Chang-Ying, sent by the seven counties, the county two thousand ride for Chen Road. ”“ Yan Shi ancient Note: ”County, each for the hair soldiers on display in the road, that pet also. The beginning of the word see, began to use the system, in ancient books, began in Xuandi, according to Juyan, Dunhuang two woodcut, then began in the early Emperor Wu Shi. , So for the “Hun Biography” of Han Chang issued by the seven counties, can not be interpreted as having been the instruments, only note for the past .This test has been divided into two categories, one is the first pass , People have not yet started, equal to the notification form