Based on the materials of fieldwork and using modernization as analysis framework and the cultural items in marriage field as analytical units,this article investigates the transition of marriage and its dynamic mechanism of two Miao branches,“Hmongb”and “Ad Hmaob”at the Sanjiao village from a perspective of ethnic group theory.The findings suggest that,over the past 30 years of China's opening -up and reform,these changes are mainly manifested in aspects like temporal and spatial dis-placement of marital spouse,the range of intermarriage extending inside -out,the increasing content of marriage etiquette,the cost of marriage changing from low cost maintaining to high cost burden and the special marriage custom from “folk optimum”to“dual coexistences”.The cultural motivation mechanisms behind are:the Miao people's self -consciousness awakening guided by the national modernized “order planning”,and the catalytic effect by the independent innovation of Miao's culture.%在田野调查基础上，文章以现代化为分析视角，以村落婚姻场域诸文化事项为分析单元，从族群理论视角探析了改革开放30余年来“蒙”和“阿卯”传统婚姻的变迁：婚恋对象发生时空位移，通婚范围突破族群藩篱和地域界限，择偶标准趋向多元化，择偶权力呈现代际更迭，婚姻仪礼由简变繁，婚姻开支从低成本维系到高成本负担，特殊婚姻习俗从“民俗优位”走向“二元并存”。文章认为，推动婚姻变迁的文化动力机制是：国家现代化“秩序建构”谋划的引领；民众自我意识的觉醒激活了婚姻变迁的主体力量；苗族文化自主适应与创新需要的催化效应。
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