Abstract: In order to cultivate students' comprehensive ability and higher order in solving complex problems, and to promote advanced teaching reform in the classroom, This article takes the difficulty of plastic mechanics teaching in engineering mechanics undergraduate course-Lode stress parameter as an example to construct a "three -in-one" advanced classroom teaching system. With the Lode stress parameter as the core content, follow the pre-class, in-class and after-class to carry out high-level research around its relevance, expansion analysis and engineering application,combining teaching and learning organically, expanding and analyzing the three invariants of Lode's stress parameter and stress deviatoric tensor, giving out the plastic deformation corresponding to nine kinds of stress states in engineering, providing new ideas for advanced classroom reforms.