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The purpose of this study was to estimate reliability and validity of Lifecoordi DS500(calorie tracker) which was developed in south korea in 2010. The participants of this examination were 93 male and female who were at D university in Daejeon. Test-criterion was examined by using Japanese Suzuken company's KENZ Lifecoder Plus model to estimate the validity of Lifecoordi. Following the purpose of this study, both KENZ and Lifecoordi were attached to subjects, after then they took 'walking and running' two times repeatedly by running machines with controlled time and speed. The correlation analysis was assessed by using SPSS 16.0. The result from the analysis of Lifecoordi's validity; the number of walking r=.911(p=001), distance r=.866(p=.001), calorie r=.784(p=.001), total calorie r=.343(p=.023). Depending on the speed, the reliability was different; in 6km/h - the number of walking r=.641(p=.001), distance r=.661(p=.001), calorie r=.579(p=.001), total calorie r=.932(p=.001) ; in 7km/h - the number of walking r=.500(p=.001), distance r=.449(p=.001), calorie r=.675(p=.001), total calorie r=.948(p=.001) ; in 8km/h - the number of walking r=.464(p=.001), distance r=.656(p=.001), calorie r=.777(p=.001), total calorie r=.939(p=.001). We conclude that the Lifecoordi is a reliable and valid instrument to assess physical activity for Korean adults. In the future, Lifecoordi, a domestic invention, is strongly expected to be flourished and to be used in the study of physical activities.