Based on the research project, taking the bending resistance of PP-ECC beam as an example, and combined with the experimental teaching of concrete beams in building materials, this paper analyzes the differences of RC beam and PP-ECC beam in crack shape, width, deformation development and bearing capacity, and summarizes and explores the new methods and new ideas of bending experiment of beam structure with new materials. The innovation and reform of beam structure experiment teaching mode, which integrates scientific research, engineering practice and experiment, is put forward. The exploration of this new mode is the optimization and supplement of traditional teaching, which can provide ideas for the innovation of experimental teaching in other courses, and is conducive to stimulating the students' interest in experiments, cultivating their ability of using software to process experimental data and analyze experimental results, as well as the comprehensive ability of combining theory with engineering application.