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Background: The purpose of this study was investigate the effect of diaphragm respiration exercise applied to health adults on respiratory function and walking distance. Method: The all subjects are healthy and participated voluntary We had divided 2 group (12 people to compare group, 12 people for diaphragm respiration exercise group). The effects on respiratory function were measured with Spirometer and walking distance were measured with 6 minute walking test. And the t-test was conducted to analyze among the compared group, the diaphragm respiration exercise group the differences between before and after the experiment. Result: Diaphragm respiration exercise group was a Forced Vital Capacity(FVC) and MEF75%, MEF50%, MEF25% increased significantly(p<0.05) between before and after exercise. The control group, however, showed increase MEF25%(p<0.05). Conclusion: Diaphragmatic mobility and FVC, MEF50% were affected by the diaphragm respiration technique, and it is method in order to improve respiratory function.