Many colleges and universities in Taiwan have implemented research courses into the school curriculum in an effort to meet the demands of higher education and requirements of graduation. However, not many researchers have proposed a guideline in mentoring English major undergraduates in their research proposal writing in Taiwan. Furthermore, to date few publications exist that could guide mentors on how to mentor undergraduates during the research writing proposal process. The purpose of this study is to share a proposal mentoring guideline that was used for mentoring undergraduate researchers.