Prolonged second stage of labor in predictor of dystocia, and will increase incidence of perineal laceration, sidecutting, infection of chorion and postpartum hemorrhage[3]. For women with vaginal delivery in our study, there was no significant difference in incidence of postpartum hemorrhage; but for women with length longer than 2 h, the bleeding volume was significant higher in cesarean section group. It indicates that not prolonged labor but the deli