ABSTRACT The purposes of this study were to understand the psychological skills of badminton players in Taiwan, and to compare the differences in psychological skills between two badminton skill level players, the differences between male and female players, as well as the differences among players with different years of playing badminton.. The study adopted “Athletic Psychological Skills Inventory (APSI)” as the quantitative research tool, in which badminton players in Taiwan were studied as the subjects, and interviews with players were used as qualitative research. The data were analyzed through SPSS 10.0 and an independent t-test. The results were as follow: 1. 300 badminton players were asked to fill in APSI, out of which 286 were effective. The effectiveness was 95.33%. The average age is 19±3.7, and the average years of playing badminton are7.67±3.6. 2. On all the subscales of APSI, badminton players in Taiwan got the best weighing on “teachability”, “motivation” the second, “pressure handling and adversity accommodation” the third, “concentration” the fourth, and “confidence” the fifth. 3. All the 286 players were divided into groups according to three categories: “badminton skill levels”, “genders” and “years of playing badminton”, and the data were analyzed through t-test. In the categories “badminton levels” and “genders”, players also got the best scores on “teachability”, the second on “motivation”, the third on “pressure handling and adversity accommodation”, the fourth on “concentration”, and the fifth on “confidence”. Only in the category “years of playing badminton”, players with more years of playing badminton got better scores on “pressure handling and adversity accommodation” than on “motivation;” while players with fewer years of playing badminton got better scores on “motivation” than on “pressure handling and adversity accommodation.” Key words: badminton, skill level, psychological skill