After analyzing the current problems of experimental teaching in program design courses, this paper proposes a progressive and spiral experimental teaching mode based on the EduCoder online training platform, with the content of "basic experimentscomprehensive experiments-course design-program design competition", from "Point-Line" to "Surface" and then to "Body". The experimental teaching data of the two courses in the past two years are organized and analyzed, the data shows that the "Point-LineSurface-Body" experimental teaching mode based on the EduCoder platform is beneficial for cultivating excellent computer major students.