The reasons for the formation of the system of polygamy, not only related to their natural living environment, but also related to the wars between Han and Qiang nationalities, Qiang's mode of production, customs and habits, etc.Lacking of soil trace element zinc in Qiang people's living region was the reason why the women of child-bearing age were nutrition deficient, this kind of situation led to many pregnant women's death.The causes about the decline of man population in Qiang: the wars between Qiang tribes, the wars between Han and Qiang nationalities, they were shamed of being ill and they would stab themselves when they were ill.Thus, in order to make more women in child-bearing age get pregnant, Qiang people who strengthened themselves by abundant population made the system of polygamy their best lifestyle to live.%羌人"饶妻制"的形成,不仅与其生活的自然环境有关,而且与羌汉战争以及羌人的生产方式、风俗习惯等因素息息相关.羌人生活地区土壤微量元素严重缺锌,造成育龄妇女营养缺乏,引发妊娠期女性大量死亡,而羌人各种族间的斗争和与汉的战争以及其风俗以生病为耻,每病辄以刃自刺的习俗,使男性人口大量减少.因此,依靠人口强盛生存的羌人,为使更多的育龄女子受孕,"饶妻制"就成为其繁衍生存的最好方式.
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