Abstract: The experiment is an important part in teaching many science and engineering courses, but it is very difficult for some courses to have a very good effect. As an example, the difficulties of experiment in the course of structural mechanics are discussed in terms of several typical experimental models in this paper. A classroom demonstration is put forward with a number of implementing cases. It is found that the classroom demonstration could increase student's ability to solve problems by combining theory with practice. Finally, an experimental model is suggested for classroom teaching and experiment of structural mechanics.