Abstract:The virtual simulation technology in the application of computer technology has become possible to realize the three-dimensional simulation training of the virtual scene in each field. In this paper, the development and design of virtual scene training system based on Unity3D simulation platform is studied in this paper. Starting from the research on the key technology of 3D simulation training system, research on 3D scene optimization, collision detection, dynamic loading logic physical scene and network communication as the focal point of development, the 3D simulation training system design a more advanced and realistic virtual situations. And the fire department as the inspection department of the application system, the detection results indicates that this system can well show the scene simulation degree and logic, to strengthen the training of technical and application effect of the fire department has a very strong advantage.