Students already learned about the law of conservation of momentum in middle school. How to reflect the advancement, innovation and challenging in college physics teaching, and how to make students feel more fresh and deep cognition are the matters that teachers need to ponder. This paper attempts to integrate the study of optical pulling force into the teaching of the law of conservation of momentum, and through the discussion of the physical mechanism that generates optical pulling force, demonstrates how to introduce cutting-edge scientific research into university physics teaching, so as to improve the advancement, innovation and challenging of the teaching, and stimulate students' learning interest and in-depth understanding of basic knowledge.