Background: The aim of this research was to assess effect of 8 weeks aerobic exercise on pulmonary indexes of force vital capacity (FVC) and force expiratory volume in one second (FEV1) in obese women. Methods: Initially, a total 200 women of National Iranian South Oil Company (name of the place) were enrolled in this study. Subsequently, 40 women with body mass index ranging from 25 to 29.9 were selected as study population. The study population was devided in 2 groups, each with 20 women. One group (experimental group) performed aerobic exercise for 8 weeks and the other group did not perform any specific physical exercise. FVC and FEV1 were measured in all subjects before the commencement of the study and after the end of the study. Results: The age of the subjects ranged from 40 to 50 years. There was no significant difference in values of FVC and FEV1 between experimental study population and control group at start of the study. However, the levels of both FVC and FEV1 increased significantly in experimental group compared to control group.