This study aims to find out what types of writing can improve the self-efficacy and motivation of foreign students. According to many previous studies, self-reflection can improve student's self-efficacy. So this study investigates whether expressive writing about self-reflection using second language can improve foreign student's self-efficacy based on previous research. Also it examines whether expressive writing about self-reflection has a positive effect on the motivation of foreign students. In this study, foreign students were divided into two groups, and then they wrote a different types of writing. One group of students wrote an expressive writing about self-reflection. Another group of students wrote transactional writing such as descriptive writing or persuasive writing. As a result, both self-efficacy and motivation have improved significantly in both groups. However, self-efficacy of transactional writing group increased more than an expressive writing group unlike previous studies. In conclusion, this study revealed that the type of writing affecting positively the improvement of self-efficacy and motivation can be different in the second language learning and writing.(Hankuk University of Foreign Studies)