It is of great significance to apply case study to teaching physics in order to improve the quality of talent cultivation. This method can connect classroom teaching with daily life, and arouse students' interests, Furthermore, undergraduates can improve their awareness of innovation as well as problem-solving ability, In teaching the course "Functional Materials", the author finds that case study is an effective way in course study. Students investigate cases, read the course book, analyze the cases before class, and discuss in class, so that teachers can make full use of the limited class time, Thus, grately improve the teaching effect.