| This thesis starts its point from Buddhism's propagation , takes the northern groups as observing target who participated in the propagating of Buddhism directly. On basis of history about Buddhism thought which phylosophers has constructed ,the author tries to describ or construct systematically and comprehensively about the living con- dition and their affection of the people mentioned above , especially of those living at the bottom of society not recorded in formal hitory.This thesis consists of 9 sections.At the beginning is an introduction, and the following is main contents , including 8 sections.Section 1 focuses on the rapid changes of hitorical background during the 3-6 century . Such as rapid change of climate , change of the boundary between traditional agriculture and animal husbandry(moved... |