本研究之目的在探討硬式網球拍大、'1、拍面及不同綱線張力和不同綱線材質對於碰撞後彈性恢復係數的影響。將實驗的網球拍握把柄固定在虎頭鉗欽土，調整網球發球機所射出之球與網球拍做正面垂直碰撞，再由Nac高速攝影機以每秒1000張之拍攝速度將整個實驗過程拍攝下來，並配合PeakPerformance的軟體，將所拍攝的錄影帶資料加以數位化處理，並將所得資料 經過統計處理。結果顯示如下:一、由變異數分析摘要表，顯示出綱線、張力、拍面大小之閹三因于交互作用(F=O .35 P<0.05)未達顯著，但綱線(F = 16.45 P < 0.05)、張力(F = 26.45 P < 0.05)及拍面(F = 17.49 P<0.05) ，對COR關係都達顯著水準。因此得知三因于對於COR有顯著的影響效泉。二、在硬式網球拍中，大拍函、綿線、張力40磅時的COR值最高，以及在不同的球拍面之組合，在張力40磅時COR值顯著高於其它張力。五、在硬式網球拍中，同一種綱線及同一種張力之組合，大拍面COR值高於小拍函。四、在硬式綱球拍中，同一種球拍面及同一種張力之組合，綿線COR值高於耐龍線。

The purpose of this study was to investigate the effect of racket size， string material and string tension on the coeffient of restitution (COR) for tennis rackets. In order to get accurate results， the racket was fixed with the clamp and the tennis ball was controlled to impact the racket vertically. The whole experimental procedure was filmed by NAC high speed camera at the rate of 1000 frame per second. The video tape was digitized using Perk Performance System， and the date were then analyzed with three-way ANOV A.The result of this study were summarized as followed: 1. For tennis racket， the interaction effects among the racket size， string material and string tension are not significant， but each individual factor (racket size， string material， or string tension) has significantly effect on the COR value. 2. The COR value of 40-1 b string tension racket is significantly higher than those of other string tension for tennis. 3. The COR value of over-size racket is significantly highetr than of small size racket for tennis. 4. The COR value of cotton string racket is significantly higher than of nylon string racket for tennis.