关键词： 移民政策, 人口迁徙, 战略枢纽, 汉中, 战争

Abstract: The periods of Warring States (475 BC-221 BC),Qin (221 BC-207 BC),Han (202 BC-220) and Three Kingdom (220-280) saw frequent wars in Hanzhong,a strategic hub.In the struggles for Hanzhong,military groups often took mandatory immigration policy as the main means to win the strategic initiative.The widespread use of this policy was closely related to the continuous expansions of the scale of the war,the continuous extensions of the combat areas,and the overall growth of the population,significantly impacting the trends of war.As an integral part of themilitary strategy during these periods,the precise implementation of the immigration policy played a positive role in enhancing the fighting capacity of various military groups,consolidating defense,ensuring the supply of war logistics,and weakening the strength of the other side.

Key words: immigration policy, population migration, strategic hub, Hanzhong, war