With the development of science and technology and the popularity of online education, the MOOC era is coming. This paper draws on the three-dimensional grammar teaching concept proposed by Larsen-Freeman to study a teaching model based on MOOC. It focuses on students' autonomous online learning and the teachers offer detailed answers to the students’ questions and doubts. It is a multidimensional teaching model including English grammar acquisition, grammatical ability improvement and the cultivation of intercultural communication competence. It can promote the further integration of network technology and grammar teaching, cultivate the students' independent and study learning capability.