Learning engagement is one of the most direct and continuous problems in educational practice. As a key element of online learning quality, effective evaluation of students' learning engagement in online learning can promote students to actively participate in the process of online learning. However, it is not clear which indicators can reflect learners' learning engagement in the process of online learning. Therefore, from the perspective of social network analysis, this study explored the relationship between learning behaviors and learning engagement, defined the evaluation indicators that can represent online learning engagement and attempted to build an evaluation model of MOOC learning engagement.