This study proposes a research direction of personal epistemology in grammar education. First, it examines epistemology as the theoretical foundation of personal epistemology. Second, it reviewed relevant studies and educational cases concerning personal epistemology to derive key insights into grammar education. Lastly, it explores the aims, scope, and challenges involved in developing a theoretical framework for personal epistemology within grammar education. Research on personal epistemology in grammar education is framed within the epistemology for grammar education, in relation to philosophical inquiry and instructional design.