The application of virtual simulation experiment can improve the effect of theory and practice integrated teaching, improve students' learning intrest, and avoid various unfavorable factors of hardware experiment effectively, to achieve the goal of reducing teaching cost and promoting teaching reform. A new idea of circuit simulation software developmt based on FLASH software's object-oriented development is proposed in this paper from the viewpoint of practical applications, an overall architecture scheme of software realization and the whole function modules' realization method are given also. The practice results indicate that, the development thinking is feasible, the teaching application of coresponding software have a good effect. The software can be used in the simulation testing of electrical engineering design, and also has a strong ability of sustainable research and system upgrade.