Abstract: “High-level, innovative, challenging" is the key to the construction of first-class courses. Firstly, according to the characteristics of the automobile diagnosis and detection technology course, combined with the existing problems in the traditional course teaching, this paper puts forward the teaching mode of "three-in-one, three-level progression". Then combined with teaching experience, using online and offline mixed teaching, curriculum innovation and reform were carried out in terms of concept transformation, goal orientation, ability improvement, method reform, and evaluation change, which improved students' learning ability, practical ability and innovation ability. The innovation and reform of the curriculum have laid the foundation for the construction of the first-class specialty of automotive service engineering.

Key words: "Three-in-one", "Three-level progression", First-class courses