Objective To survey the cognition of women to labor analgesia in Shanghai.Methods One hundred randomized pregnant women filled in the questionnaires at obstetric outpatient department in our hospital.One hundred women took part in the survey after labor at maternity ward,ninety of whom underwent patient-controlled epidural analgesia with 0.1% ropivacaine plus 0.002% fentanyl,and the rest 10 inhaled 50% nitrous oxide mixed with 50% oxygen.Results Before labor analgesia,98% pregnant women thought that the labor was painful;42% were nervous and frightened about the labor pain;90% knew nothing about labor analgesia;63% had no idea about the influences of labor analgesia on infants;and 14% worried that analgesia would have side effects on infants.After labor analgesia,99% women were satisfied with its pain relief effect;100% considered that labor analgesia was necessary;and 20% worried about their newborn babies.Conclusion It is necessary to popularize the knowledge about labor analgesia,which is an important part of work on labor health.