This paper uses data from the 2014 China Family Panel Studies to carry out analysis on the household scale and structure，and explore the relation and influence among living arrangement，marriage，and childbearing. The paper also proposes problems facing the process of family development，and provides policy recommendations for the improvement of family policies. The study shows that with the effect of marriage，childbearing，and migration，the household scale has decreased to three persons who belong to one generation. The structure of household is often composed of the core family members，and there is a high percentage of single person household. Under the new situation，a comprehensive reform should be carried out regarding family policies，and government departments should be coordinated to support the new childbearing policies. Furthermore，family service system should be constructed，and family development policy should be promoted.