Objective To investigate the risk factors of incidence of premature rupture of membranes and provide reference for prevention of premature rupture of membranes.Methods 890 cases of infants and maternal were studied,analyzing and screening the risk factors of premature rupture of membranes by Logistic.Results The single-factor analysis showed that the pregnant women with diabetes,pregnancy-induced hypertension,multiple preg-nancy and vaginifis had certain degree of contact with incidence of premature rupture of membranes.Multivariate Lo-gistic regression analysis showed that the multiple pregnancy and vaginitis were risk factors of incidence of premature rupture of membranes.Conclusion The multiple pregnancy and vaginitis were risk factors of incidence of premature rapture of membranes,assessment and control these risk factors could prevent and reduce the incidence of premature rupture of membranes.