Purpose: To determine the effect of breathing exercise in outcome of labour among primigravida mothers. Objectives: 1. To determine the effect of breathing exercise on outcome of labour among primigravida mothers. 2. To compare the outcome of labour between control and experimental group of primigravida mothers. 3. To determine the relationship between breathing exercise and outcome of labour in experimental group. 4. To determine association between breathing exercise and outcome of labour in experimental group. Result : The primi gravida mothers who practiced the breathing exercise on labour experienced mild level of pain. There was a positive relationship between breathing exercise and outcome of labour. There was significant association (P<0.05) level between breathing exercise and demographic characteristics such as education and income.