[Objective] Discuss the incidence and early treatment of the trimester placental abruption with premature rupture of membranes.[Methods] Retrospective analysis retrace from January 2002 to December 2005 the maternity hospital obstetric cases PROM.There were nine cases in which persons with placental abruption,abruption placentae were BY compared with the non-occurrence of premature rupture of membranes,we made an analysis about the relationship and neonatal outcomes in the analysis of early diagnosis and treatment.[Results] Four years,among the total number of 3998 cases of birth,the fact that premature rupture of membranes with placental abruption who accounted for 45% of all placental abruption made premature rupture the most essential trigger of the and placental abruption PROM for the first incentive.The incidence rate of placental abruption PROM is 2.97%,while 0.30% with premature rupture of membranes group rather than 0.30%.The marked differences between two groops are:was significance(P 0.001),high rate of abnormal fetal heart rate and a small amount of amniotic fluid for congestive,which are the usual clinical manifestations.[Conclusion] PROM is an important incentive for placental abruption.Paying attention to every unusual clinical manifestations after PROM will be helpful to early diagnosis and treatment,which would reduce infant and maternal complications.