OpenFlight is one of the standard formats in Virtual Reality applications. But it only provides crude 3D modeling. Therefore most of the users prefer to build up 3D models in 3DS Max software, while the models created in 3DS MAX could not be used directly in a virtual reality environment. This paper proposed a solution for format conversion between 3DS Max and OpenFlight. Among others it focused on combining triangle meshes in 3DS format into entire faces. A program followed the method proved its availability. The application of this program in a transportation safety education system showed that it has good effects.