A turntable is needed to simulate the motion of ground vehicles in laboratory. Such a turntable was presented in the paper. The basic structure of the turntable was that it could rotate around their own 3 axis, thus all forms of motion of ground vehicles could be simulated. The mechanical performance of the turntable was studied by virtual prototyping method using software CATIA, including structural characteristics, centroid, moment of inertia and turning space. Mechanical analysis was performed, the deformation and stress distribution of the turntable were analyzed. The modal analysis of the turntable was performed using FEM method. Those analysis results show the 3-axis turntable can simulate the motion of ground vehicles.