Taking the electronic analytical balance used in the experimental teaching in colleges and universities as an example, this paper focuses on the teaching purpose of experimental teaching to cultivate students’ experimental skills and practical ability to discuss the standardization and modularization and develop the corresponding virtual simulation instrument unit. This design not only retains the operation steps and experimental phenomena of electronic analytical balance with high simulation degree, but also provides standard references for other experimental projects, realizes the efficient development and operation of virtual simulation experiment teaching system, and improves the multi-level experiment teaching system.