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Purpose: This study was to norm-referenced criteria of cardiorepiratory fitness for the Korea pro-baseball players. Methods: Data were obtained from one hundred twenty nine pro-baseball players. They didn't have any medical problem. They performed exercise stress test on treadmill. The assessment of cardiorespiratory fitness were O2 max, AT-O2, AT-%O2 max, Maxmal Heart Rate and AT- Heart Rate. The study were presented as a norm-referenced criterion value using 5-point scale. Results: O2 max mean value is 49.6~55.1mLkg-1min-1, AT-%O2max mean value is 34.4~41.3mLkg-1min-1, AT-%O2 max mean value is 69.9~76.3%, Heart rate max mean value is 183~191.4beatmin-1, AT- Heart rate mean value is 157.9beatmin-1. These results suggested that very useful on athlete trainer, rehabilitation specialist, baseball coach. Conclusion: Cardiorepiratory fitness evaluation by use of AT-Heart rate is very important factor.