The purposes of this study were three-fold: (1) to compare the differences of goal orientation, sport motivation and beliefs about success between aboriginal and non-aboriginal professional baseball players; (2) to examine the relationship of goal orientation, sport motivation and beliefs about success. The t-test independent and Pearson product moment correlation were used as statistical methods. One hundred fifty baseball players from the Chinese Professional Baseball League and the Taiwan Major League (average age=26.95±4.8) participated in the study. During non-competition periods, the subjects completed a questionnaire that asked about their goal orientation, sport motivation and beliefs about success. The results indicated that the extrinsic motivation of aboriginal players was significantly higher than non-aboriginal players, and the relationship of goal orientation, sport motivation and beliefs about success was significant.