Abstarct: Objective: The aim of this study was to evaluate the Compare the effect 8 weeks of endurance exercise and respiratory muscle training on the lung function of male mountaineers . Method: This study was a clinical trial and included pre-test and post-test. The statistical sample of this study consisted of male mountaineers, with an average age (45.11 + 6.1 years) and body mass index (23.82 + 0.76 kg / m2), which were randomly divided into 3 groups. 10 people: 1- Endurance exercises 2- Respiratory muscle exercises and 3- Control group. Spirometry test was taken from all subjects before and after the training program. Group 1 Endurance training for 8 weeks, which includes 3 sessions per week for 50 minutes in each session (10 minutes of warm-up, 40 minutes of running with an intensity of 55 to 75% of the maximum heart rate stored on a track and track and 10 minutes of cold Were), did. Group 2 also performed a training session with the Power Breathe mechanical device for 8 weeks. Dependent t-test was used to assess the difference within the group, ANOVA test was used to assess the difference between the groups and Bonferroni post hoc test was used to identify the groups that made a difference in the ANOVA test (P <0.05). Results: Respiratory indices SVC (P = 0.0001), FVC (P = 0.009), FEV1 (P = 0.006), PEF (P = 0.003), %25-%75 FEF (P = 0.0001), MVV (P = 0.011), and VO2max (P = 0.046) There was a significant difference in the group of respiratory muscle exercises. in the endurance training group, there was a significant difference in Respiratory indices SVC (P = 0.03), FVC (P = 0.019), FEV1 (P = 0.021), PEF (P = 0.043), %25-%75 FEF (P = 0.033), MVV (P = 0.024), and VO2max (P = 0.048). Conclusion: According to the results of this study, it seems that the use of respiratory muscle training (Power Breathe mechanical device) and endurance training can improve pulmonary function.