In order to test the small motor used in molecular pump,an experimental platform was designed for the motor.Because the tested motor ran at a high speed(＞20 000 r/min) and was placed in high vacuum environment(＜100 Pa),a high precision location datum,small vacuum room to simulate the actual running environment for the motor,an inertia disk to simulate moment of inertia of the actual load and other parts were designed to make experiments easier.By the designed experimental platform,a lot of experiments to measure the performance of the motor have been made.