Firstly，through the investigation and analysis of the current situation of

demonstration experiment in colleges and universities，it is found that most of the science and

engineering colleges and universities have less class hours，low utilization rate，and can not

achieve the desired teaching effect. Secondly，it is proposed that teachers should

constantly carry out the innovation and practice of teaching ideas. According to the

characteristics of their own teaching in colleges and universities，the portable classroom

demonstration experiment instrument is de- veloped and designed，and the portable classroom

demonstration experiment system is constructed. Finally，taking the portable wave optics

demonstrator used in the teaching process of single slit diffraction of wave optics in the sec- ond

semester of the junior year as a teaching case，the role of physics demonstrator in the daily

teaching of cultiva- ting students' physical thinking and innovation ability is expounded