Building a modern high-level university is the goal of colleges and universities.Cultivating high-level talents is the main mission of colleges and universities.Integrating teaching with undergraduate and postgraduate studies gives full play to the learning interests,hobbies and abilities of students at all different stages,and it is a new integrated teaching model.Especially in the teaching of professional courses,it plays an increasingly prominent role.Flipped classroom is an innovative teaching method for undergraduate and postgraduate integrated course teaching.This study takes the Composite Mechanics integrated undergraduate and postgraduate course at Beijing Jiaotong University as an example.In the cutting-edge topic discussion section,five different topics were set up to guide students to choose their own teams and topics.The flipped classroom teaching assessment was carried out.The evaluation method of student mutual evaluation and teacher-assigned coefficients was set up.The graded scoring weighted algorithm was used to quantify the evaluation of the flipped classroom teaching effect.The characteristics of the knowledge dimensions received by students in the flipped classroom in this study were analyzed.This case provides a good practical case for the teaching of this integrated course.