With the continuous improvement of Internet and multimedia technology, “Internet + education” has formed a new educational ecology based on the Internet, and has also given a new and unique connotation to blending learning. The application has developed rapidly. This paper combines traditional classroom teaching with online teaching, and uses the Internet teaching platform and resources to build a student-centered, teacher-led, integrating information technology and traditional education models in theoretical and practical courses. Through the continuous improvement of teaching mode through feedback at each stage, the teaching practice of blending learning in data mining courses is discussed, so as to improve students' practical innovation ability, in-depth theoretical research interest and teamwork ability, in order to realize the teaching atmosphere of “independent exploration, cooperative learning, practical innovation, and resource sharing”.