Background and Objective: One of the problems that the women are faced with is prolonged labor, leading to high possibility of infection, hypoxia, physical, neural damage and death of fetus and neonate, newborn death, postpartum hemorrhage, increased maternal insomnia and fatigue. This research aimed at determining the effects of acupressure on Sanyinjiao - Hegu points in nulliparous women.

  Material and Methods: This double blinded-randomized clinical trial was conducted on 84 nulliparous referring to the hospitals in Ardabil, 2012. The subjects were randomly allocated to intervention and control group. The intervention was the pressure applying on Sanyinjiao - Hegu points in different dilatations. The Length of the first and second stage was recorded by vaginal exam and the data was analyzed by f SPSS- 16, using Chi-Square and independent t- test.

  Results: the mean of active phase in intervention group (2:15±1:19 hour) compared to control group (4:10±1:59 hour) was decreased (p=0.001). The length of second stage in intervention group (00:45 ± oo: 25 minute) in comparison with control group (1:04 ± 00:39 hour) was reduced (p=0.008).

  Conclusion: Acupressure on sanyinjiao-hegu points resulted in shortening the length of active phase and second stage of delivery. Because of being simple, inexpensive, safe and acceptable for clients, it can be used in training and clinical practice of midwifery students.