This randomized control trial, single-blind, with control group and single-center study is designed for exterminating and comparing the effect of heat and cold therapy on outcomes of labor and satisfaction in primigravida women.One hundred twenty low risk parturient women are randomly divided to three groups: heat therapy, cold therapy and control groups. The main inclusion criteria consisted of nulliparous women, 18 to 35 years old, early active phase (3-4 cm dilatation), cephalic presentation, 37-41 weeks of gestation, and singleton pregnancy. exclusion criteria include pre diagnosed of psychological and anatomical disorders, indications for cesarean section, history of chronic pelvic pain, use of narcotics and sedative and skin diseases in intervention area. Intervention will apply in the form of heat and cold therapy in the first and second stages of labor. Outcome variables include pain severity in first stage (3-4, 5-6, 7-8 and 9-10cm dilatation) and second stage of labor with the McGill Pain linear scale, duration of the first, second and third stages of labor, fetal heart rate in the first stage, mode of delivery, Apgar score, the first lactation, hugging the baby after delivery and variables of maternal satisfaction. Finally the items listed in each of the three groups will be compared.