This study is a randomized single blind clinical trial carried out in order to estimate the effect of breath technique and aromatherapy by essence of lavender on labor pain in an educational hospital of Shahrood. Subjects were primiparous pregnant women, without acute or chronic disease or allergy with singleton fetus and candidate for vaginal delivery. 240 women (60 in each group) were allocated into 4 groups based on blocks randomization method: breathe technique with essence of lavender conducted by nebulizer, only breath technique, essence of lavender conducted by nebulizer, water conducted by nebulizer for control group of Lavender. Breathing technique was educated to women before starting active phase (4 centimeters dilatation). Lavender 1.5% and usual water were used. Pain was measured by visual analog scale in dilatations 4-6, 6-8 and 8-10 centimeter, one time in each dilatation category. Participants were excluded if they showed allergy to Lavender or were candidate of caesarean section.