Fertility involves physiological conditions, economic level and socio-cultural factors, which have an important impact on the parents' physical and mental health. In addition to the direct physical pain (pregnancy complications, pelvic floor dysfunction, etc.) caused by childbearing and the comprehensive physical and psychological discomfort (such as postpartum fatigue and postpartum depression) caused by short-term role change and family structure change, economic factors (such as the change of parents' economic status, the cost of children's marriage, etc.) and socio-cultural factors (such as "more happiness comes with more offspring", "bring sons to support parents in their old age", "The mother's honor increases after her son’s birth "and " skip-generation raising) also have an impact on the physical and mental health of parents after childbirth. Future research should pay more attention to gender and cultural differences, three-dimensional analysis(time, gender and quantity) of reproductive behavior, the impact of modern society on reproductive culture and the improve measures to parents' physical and mental health.