Abstract: In college classroom teaching, the primary problem affecting teaching quality is students' learning attitude. How to mobilize students' learning enthusiasm is a problem worth thinking about for every teacher. This paper takes the course of mechanics of materials as the carrier, combines the Pareto's law of management, and takes the mechanics competition of college students as an opportunity to carry out deep interaction and communication between teacher and students. Deep interaction is divided into two levels: the interaction in the course teaching and the interaction of mechanics interest group. Through interaction, on the one hand, it opens the way for excellent students to improve, and on the other hand, it sets excellent students as examples to influence the learning attitude of other students imperceptibly, so as to improve the learning atmosphere of the whole class. The practice shows that the deep interactive teaching mode effectively stimulates students' interest in learning mechanics of materials and achieves good teaching effect.