As an important part of the social morality construction, the problem of "extramarital relationship" has always been the focus of rectification of the government at all levels. But before the complete change of social and economic structure, the traditional objective existence and subjective consciousness still influenced the behavior choice of rural people. In addition, the symbolic meaning and capitalization of the body, and some negative effect of the implementation of marriage policy made the problem of "extramarital relationship" unsolved. In fact, from the perspective of tradition, body and policy, the problem of "extramarital relationship" can't be regarded merely as the so-called "corruption" and "backwardness" in the Bases and Liberated Areas of North China. The tradition, body, policy and the problem of "extramarital relationship" were intertwined, which showed that women's liberation still has a long way to go.