To observe the effect of different epidural labor analgesia methods with Ropivacaine and Sufentanilon postpartum urinary retention(PUR).Methods Totally 76 pregnant women undergoing vaginal childbirth with epidural labor analgesia were randomly divided into two groups,i.e.group A (using 0.1% Ropivacaine and 0.3 μg/ml Sufentanil)and group B (using0.075% Ropivacaine and 0.5 μg/ml Sufentanil).In all th epatients epidural catheters were placed into L3-L4 epidural space at 3-cm cervical dilation forinfusion of the analgesics.The Visual Analogue Scale(VAS),the Rating Scale for Muscle Strength of the legs,PUR of the delivery women and the Apgar scores of the infants were recorded.Results The VAS score after epidural labor analgesia was less than 4 in all of patients,but there was no difference between the two groups( p> 0.05).Muscle weakness was not observed in any delivery woman.There were no significant differences in the Apgarscores of the infant between the two groups(p >0.05).PUR was observed in 2 patients of the group A and 8 patients of the group B 6 hours after childbirth ( p<0.05),but not observed 24 hours after childbirth.Conclusions Epidural administration of 0.1% Ropivacaine plus 0.3 μg/ml Sufentanil or 0.075% Ropivacaine plus0.5 μg/ml Sufentanil can effectively relieve pain of labor,but the risk of PUR is lower with the former analgesic regimen.