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To grasp the relationship between let and stroke in squash game, I got these conclusions from analytical results of 17 games 72 sets of 11 excellent foreign players in PSA and in Asia. 1. The winners' average set is 4.28±8.2 for yes-let, 1.67±1.9 for no-let, 3.11±7.1 for strokes and the average set of losers is 3.14±8.2 for yes-let, 2.08±4.9 for no-let, 1.31±4.4 for stroke.2. The average points of good players in all games(72 sets) is 9.71±4.15, 3.71±2.14 for yes-let, 1.87± 1.15 for no-let, and 2.21±1.56 for stroke.3. Yes-let and stroke are directly relative with playing ability but p must be bigger than 0.05.4. No-let is an inverse proportion to playing ability so when the proportion of no-let is high, playing ability will be decreased. Consideration as these results, it is necessary for korean squash players and coaches to aware of the importances of the let and stroke through scientifical analyzing and experiment and to be requested skills demonstration of let and stroke to improve ability of play the game.