The purpose of this study was to analyze the correlation between high school students’ writing self-efficacy, writing outcome expectancy and writing score. Data was collected from high school first graders in Busan in February 2011. Researcher analyzed the correlation using the SPSS 18.0 version. First, the result showed that participants’ writing self-efficacy was moderate and writing outcome expectancy was relatively high. Writing self-efficacy about task was lower than writing self-efficacy about component skill. Second, there was meaningful positive correlation between writing self-efficacy and writing score. Especially, the correlation between writing self-efficacy about task and writing score was higher than the correlation between writing self-efficacy about component skill and writing score. However, it has to be interpreted carefully because the correlation coefficient is not big. Third, there was almost no correlation between writing outcome expectancy and writing score. Fourth, correlation between writing self-efficacy and writing outcome expectancy was very low. This result is meaningful because of statistical verification of the correlation between writing self-efficacy, writing outcome expectancy and writing score. But the result has to be interpreted carefully considering this study’s limitation that all participants were specialized high school’s male students.