At the present，the problem of juvenile delinquency in our country stage was still more serious. Juvenile delinquency first cause in the family，appeared in school learning，eventually deteriorated out in the process of socialization. There were important links between family factors and juvenile crime. Bad family structure，improper way of family education，poor family economic and cultural environment were the key factors causing the delinquent minors. It was necessary to explore the mechanism of prevention of juvenile delinquency from the family source. Good family education environment，scientific family education，family structure could effectively help to build up the juvenile crime prevention mechanism.