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This study was for the analysis of EMG(electromyographic) change of high school baseball pitcher according to pitching number increase. For the performance of this study, 5 baseball pitcher who have the player career more than 5 years were chosen and EMG measurement was done dividedly before inning, after 4 inning and after 7 inning. In that result, it was shown that EMG value at trapezius & latissimus dorsi decreased significantly in wind up phase, and there was considerable decrease at trapezius, latissimus 액냐, extensor radialis & flexor ralialis in stride phase. There was the considerable decrease at 6 of all region except for deltoid & biceps in arm cocking & arm acceleration phase, and there was considerable decrease at deltoid, latissimus dorsi, extensor radialis & flexor radialis in arm deceleration phase. lastly, there was considerable decrease at flexor radialis in follow-though phase. To synthesis this result, it was shown for high school baseball player when they pitched that EMG value according to the pitching number decreased considerably at all the main muscle after 100 times of pitching.