Considerable witty remarks accumulated by the author in the classroom teaching of Mechanisms and Machine Theory are used as examples in this paper.The functions of witty remarks are illustrated for enlivening classroom atmosphere,analyzing the emphasis or puzzles,and developing the students' morality as well as imparting knowledge.This paper points out that witty remarks are based on the rich experience and extensive knowledge,long term careful collecting and sorting,humorous habits and excellent language abilities.Meanwhile,witty remarks are aroused from teaching contents,students' response and classroom circumstances.