ObjectiveTo explore the related factors of postpartum depression among Chinese and Japanese women and analyze the cause of it.Methods587 delivery women who were from Tokyo,Japan and Henan China were investigated by using the Edinburgh Postnatal Depression Scale(EPDS) and 12-item General Health Questionnaire (GHQ-12), 352 Chinese women included and 235 Japanese women included.ResultsThe incidence of postpartum depression of Chinese women was 31 cases accounting for 8.81％ and Japanese women was 7 cases accounting for 2.98％. The number of GHQ- 12 cases were higher in Chinese women than in Japanese women. Through Logistic regression analysis, dehvery experience, having job or not, having family support or not, having someone looking after baby or not, the degree of physical pain are related factors were influencing factors of postpartum depression.Conclusions The incidence of postpartum depression of Chinese women was higher than Japanese women. Having no job is the risk factor of postpartum depression. The factors of eutocia, having someone looking after baby, the lower degree of physical pain were protective factors.