Abstract: Marriage and family have always been highly valued in Hakka clan villages in Southern Jiangxi Province. However，there have appeared a lot of “flash married” families over the past decade. This paper points out that migrant economy and village habits together form the social basis of “flash marriage”. “Flash marriage” values efficiency more than mutual love，which makes it difficult to guarantee marriage happiness，resulting in many “flash divorce” cases. Such changes in marriage in rural areas are a result of the emergence of nuclear families and the trend of personalization among rural youth，who hold more independent and open attitude to marriage. They prefer simplifier marriage ceremonies，and have increasing awareness of personal right. And the increase of divorce cases，the soaring of betrothal gift costs and the more and more serious intergenerational exploitation are also consequences of such changes.

Key words: flash marriage, flash divorce, rural youth, migrant economy, village habits, nuclear family trend, personalization