Through the study of different child care methods, it is found that the intergenerational care provided by the grandparents significantly increases the labor participation rate of married women by 19%～28.4%, that intergenerational care has a much greater impact on women's participation in labor than formal care, which may be related to the lack of available child care services, and that father care can significantly promote women’s participation when families are faced with external shocks. The government is supposed to speed up the allocation of resources for child-care services while encouraging fertility, and further promote men's participation in family life to assume family responsibilities through policy guidance and other means, and alleviate the "work-family" conflicts faced by women to affect fertility more effectively.