The advantages of non-face-to-face teaching interaction in online learning have been highlighted after COVID-19, and it has now become an international trend. However, there is also an issue of poor control ability over students' autonomous learning process. To explore how students can use tools to improve the efficiency of online course learning, this paper selects the MOOC (Massive Open Online Course) tool from online learning platform of Xi'an Jiaotong University to discuss the characteristics, advantages, and relevance of its usage to course examinations of a course learning navigation application based on knowledge graph design. In this paper, empirical research found that navigation affects the performance of online learning and that the chapter and navigation functions help students develop personal learning behavior. Q&A and peer review functions strengthen the thinking connection of group learning and improve the average exam scores. In addition, it helps managers master the dynamics of online learning to improve teaching methods. Finally, this paper gives suggestions from the perspective of scientific value and practical sense that incorporating knowledge graph as a central element in the online course design, more guidance for teachers and students to use this tool, sustainably keeping eyes on effectiveness on other educational levels, active adopting for schools and educational institutions, and being close attention to feedback and continuous improvement on functions developed.