Abstract: A high-speed 6-DOF parallel mechanism for low-speed wind tunnel tests is designed. The structural parameter of the mechanism is given by comprehensive analysis of requirement and restrictions. The characteristic of the parallel mechanism is analyzed. The vibration response at limit position of the system is calculated by ANSYS software. At the same time, flexible dynamic simulation for high-speed emergency braking is analyzed by ADAMS tool; the characteristic of high-speed braking is summed up based on comparative analysis of the rigid and flexible brake loads. The simulation results prove that it is important for application and designing the prototype of the parallel mechanism. On basis of the actual experiment, the parallel mechanism can fulfill both single degree and multi degree oscillatory motions; it also has large work space (up to 30°/500mm), high motion accuracy (up to 0.05°/0.5mm) and high-speed (up to 5m/s). In conclusion, the high-speed 6-DOF parallel mechanism has high motion capability.