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移民是一个古老的人口学现象,人口迁移受人口所处自然和社会因素的制约。总体来看,经济是人口迁移的主要因素。当人口过多,生产力发展水平低下,人类对地表资源的依赖程度严峻的时候,人口总是向自然条件较好的地区迁移。游牧民族、迁移型农业民族和渔猎民族大体属于这一类型。元阳县几次颇具规模的易地移民扶贫工程皆属迁移型农业民
Immigration is an ancient phenomenon of demography. Population migration is constrained by natural and social factors in the population. Overall, the economy is a major factor in population migration. When the population is too high, the level of development of productivity is low, and human reliance on surface resources is severe, the population always migrates to regions with better natural conditions. Nomadic peoples, migrant agricultural peoples and fishing and hunting peoples generally belong to this category. Several large-scale Yuanyang County immigrants to help alleviate poverty projects are migrant farmers