Traditional grammar teaching in higher education often disconnects from real-life contexts or is conducted in imagined, artificial settings. Compared to traditional teaching methods, utilizing online corpora, which contain vast amounts of authentic language, offers significant advantages for teaching. This study focuses on grammar, using Larsen-Freeman's three-dimensional grammar teaching theory as the conceptual basis for instructional processing, and discusses the author's attempts to apply corpora in grammar teaching. The significance of this teaching innovation lies in enhancing students' grammatical competence and exploring the feasibility of integrating corpus concepts and technologies into instruction.