Abstract: Based on the assembly fitter course, this paper takes the carbon-free trolley as the project to carry out practical teaching, so as to stimulate the students’ enthusiasm for the fitter course. This paper discusses the problems existing in the traditional fitter training courses in colleges and universities, analyzes the necessity of teaching reform, puts forward the assembly fitter course based on the project teaching method of carbon-free trolley, discusses the process of project teaching, and analyzes the advantages and disadvantages of the reform.