Big data service is a real-time scientific data analysis tool created by xuetangx.com for learning, teaching, education research and educational administration management. The tool recommends learning modules to students in accordance with their learning features; moreover, it can give feedback on the students' study progress and status on a timely basis and analyze difficulties in the teaching. This service of MOOC-CN Education helps to alleviate burdens and improve efficiency for students, teachers, teaching assistants and educational administrators. Also, it advances a new study mode that integrates online and offline teaching.