To explore the effects of leonurus injection combined with oxytocin on the uterine contractile ability and postpartum hemorrhage of cesarean section parturient.Methods:A total of 100 parturients underwent cesarean section in Nanjing Hospital of Chinese Medicine from January 2016 to December 2016 were selected and divided into control group (n=50) and treatment group (n=50) according to random number table method.Control group was given oxytocin 20 U into the uterine wall after cesarean section delivery,treatment group was given leonurus injection on the basis of control group,and 2 groups were treated for 3 days.The amount of postpartum hemorrhage in 2 groups was statistically analyzed after treatment,the blood routine and coagulation function in 2 groups were measured before and after treatment,the uterine contractile ability 72 hours after postpartum and rehabilitation status in 2 groups were compared,and the clinical efficacy in 2 groups was statistically analyzed.Results:The amount of postpartum hemorrhage in 2 groups decreased gradually from 1 to 72 hours after postpartum (P<0.01),of which the treatment group was significantly lower than the control group (P<0.01).The postpartum hemorrhage rate in treatment group was 2.00%,which was lower than 10.00% in control group,but there was no significant difference (P>0.05).Compared with before treatment data,the Hb and RBC levels in control group significantly decreased (P<0.05 or P<0.01),there was no significant change in treatment group before and after treatment (P>0.05).The Hb and RBC levels in treatment group were significantly higher than those in control group (P<0.05 or P<0.01),and there was no significant difference between the APTT and PT times of 2 groups before and after treatment (P>0.05).The amplitude,intensity and tension of parturient uterine contractions in treatment group were significantly higher than those in control group 72 hours after postpartum (P<0.01),and the frequency of uterine contractions in treatment group was significantly lower than in control group (P<0.01),which was significantly lower than control group (P<0.05 or P<0.01).The descent degree of uterine fundus,the sum of uterus three meridians and the duration of lochia in treatment group were significantly lower than that of control group (P<0.01),and the total uterine cavity hematocele rate in treatment group was 8.00%,which was significantly lower than 28.00% in control group (P<0.05); the total clinical efficiency in treatment group after treatment was up to 96.00%,which was significantly higher than 78.00% in control group (P<0.01).Conclusion:Leonurus injection combined with oxytocin can effectively reduce the amount of cesarean section postpartum hemorrhage,improve the hemostasis effect,and have less effects on its coagulation function,enhance uterine contractile ability,promote the uterine rehabilitation,and the effect is better than oxytocin treatment alone.