[[abstract]]This study aims to explore the dimensions of vocational teachers' sense of efficacy in junior colleges. Descriptive methods, aided with surveys and interviews, were used in this study to collect information on vocational teachers' sense of efficacy. The research instrument used was a self-developed survey called "evaluation scale of vocational teachers' sense of efficacy in junior colleges", which consisted of four parts: personal background information, general teaching efficacy (GTE), personal professional efficacy (PPE), and personal teaching efficacy (PTE). Study samples were 1,200 vocational teachers form 35 junior colleges there were 852 valid surveys received, accounting for 71% of the total surveys distributed. The collected data was statistically analyzed with confirmatory factor analysis (CF A) of the linear structural relation software (LISREL VII). The conclusions obtained from this study is summarized as follow: 1. Vocational teachers' sense of efficacy in Taiwan's junior colleges consists of three dimensions: GTE, PPE, and PPE. 2. Teachers' sense of efficacy is an important indicator, which reflects teaching efficacy and attitude. Finally, based on the research findings and conclusions, submitted some recommendations.