With the sample of Taiwan test and assembly factories, This research is to investigate the relationships among transformational leadership, organizational commitment and job involvement. It was found that Transformational leadership has the significant positive in-fluence to organizational commitment. Transformational leadership has the significant posi-tive influence to job involvement. Organizational commitment has the significant positive influence to job involvement. Moreover, Organizational commitment has intermediary ef-fect to transformational leadership and job involvement. Key Words: Transformational leadership, Organizational commitment, Job involvement