The purpose of this study is to investigate the relationships among principal's transformational leadership, teacher's acceptance of organizational change, and school competitive advantage. Questionnaire survey was adopted, and subjects are the faculty of junior high schools of Kaohsiung area. 590 teachers of 25 junior high schools were selected by Stratified Random Sampling according to the school size. 567 questionnaires were responded, and 557 were valid. The response rate was 96.1%. The collected data were analyzed by means of average, standard deviation, t-test, one-way ANOVA, Pearson's product correlation, stepwise multiple regression and structural equation modeling.The main findings of this research are summed up as follows: 1. The statuses of principal's transformational leadership, teacher's acceptance of organizational change, and school competitive advantage are in good condition. 2. Higher principal's transformational leadership would result in better teacher's acceptance of organizational change. Higher principal's transformational leadership and higher teacher's acceptance of organizational change would result in better school competitive advantage. 3. Principal's transformational leadership and teacher's acceptance of organizational change can apparently predict school competitive advantage, of which the "acceptance of organizational ecology change" can best predict school competitive advantage. 4. An intermediate effect via teacher's acceptance of organizational change was found between principal's transformational leadership and school competitive advantage.