Objectives:To investigate the causes and effect factors of postpartum hemorrhage(PPH)in order to prevent PPH and decrease the mortality rate of gravida and parturient.Methods:Retrospective analysis was done on the 74 cases of PPH from Jan 2002 to Jan 2006 in our hospital.Results:The incidence rate of PPH during 4 years was 2.33%(74/3178).The causes were uterine inertia(43.24%)

abnormal placenta(39.19%)

injury of birth canal(6.67%)

and dysfunction of blood coagulation(1.35%).There was significant difference among delivery style

gestational weeks

multiple pregnancy

and complications.(P<0.05).Conclusions:The retrospective analysis on the cases found that the major causes of PPH were uterine inertia

abnormal placenta

injury of birth canal and dysfunction of blood coagulation and PPH was related to style of delivery

gestational weeks

multiple pregnancy

and complications.