本研究的目的在探討不同性別、歲級及比賽成績的我國青少年網球選手其意志力之差異比較。受試對象為八十九年第三次全國青少年排名賽十八歲、十六歲及十四歲三個歲級之會內賽男、女個人單打賽的選手，共計九十六人。受試者在個人的最後一場比賽之後填寫意志力量表。以獨立樣本t考驗分析及單因子變異數分析對所搜集的資料進行統計分析（顯著水準α=.05），獲得下列之結果：1.不同性別之青少年網球選手其意志力得分未達顯著差異。2.十八歲級的選手其意志力得分高於十六歲級及十四歲級的選手；十六歲級與十四歲級的選手其意志力得分，則未達顯著差異。3.青少年男、女網球選手的比賽成績，優異組的選手其意志力得分均高於一般組的選手。

　　　　　The purpose of this study was intended to investigate the distinctions about mental toughness of junior tennis players in Taiwan among different sexes, ages, and competition results. The subjects of this research were those junior tennis players who took part in the third National Junior Tennis Ranking Tournament, 2000. A total of 96 players were asked to fill out a sheet of mental toughness immediately after their last competitions. A score scale of mental toughness was employed in this study. Data were statistically analyzed with t-test and one-way ANOVA (α=.05). Conclusions of this research were as follows: 1.For junior tennis players from different sexes, there were no significant differences in their scores of mental toughness. 2.compared with those aged 16 and 14, junior tennis players of 18 got higher scores in their mental toughness, while those players between aged 16 and 14, no significant differences in mental toughness were discovered. 3.According to the competition results, the players from excellent groups got higher scores in their mental toughness than the rest of those common groups.