本研究欲驗證國民中學教師知覺校長轉型領導行為、校長與教師交換品質、教師組織承諾三者的關係。本研究採用問卷調查法，受測對象為台中縣公立國民中學279 位正式教師。研究結果顯示國民中學教師知覺校長轉型領導行為對教師組織承諾沒有顯著的正向影響，但有顯著的間接影響效果，校長與教師交換品質對「校長轉型領導行為影響教師組織承諾」有完全中介效果，亦即國民中學教師知覺校長的轉型領導行為越高，將增進教師與校長的交換品質，進而提升教師對學校的組織承諾感。最後，本研究依據重要結論，詮釋國民中學校長的轉型領導的意涵，並提出一些建議。

This study attempts to verify the relationships among principal’s transformational leadership, leader-member exchange (LMX) quality between the principal and teachers, and teachers’ organizational commitment which are perceived by junior high school teachers. The methodology is the questionnaire survey and the subjects are 279 formal engaged teachers of public junior high schools in Taichung County.The results indicate that there is no significant positive impact of the principal’s transformational leadership perceived by junior high school teachers on teachers’ organizational commitment whereas there is a significant indirect effect. Moreover, there is a complete mediation effect of LMX quality for the impact of principal’s transformational leadership on teachers’ organizational commitment; that is, the higher perceptions of junior high school teachers for principal’s transformational leadership promote their LMX quality with the principal, and further advance teachers’ organizational commitment to schools. Finally, based on key conclusions, this study interprets the implications of junior high school principals’ transformational leadership and proposes some suggestions.