Animal ventilator is commonly used laboratory equipment, widely used in scientific experiments basic medicine, clinical medicine and animal medicine, the artificial respiration, respiratory management, animal rescue, respiratory therapy. Its control is accurate, convenient and practical, no high-pressure gas source, tidal volume output accurate and stable performance. First, the working principle of this type of animal is a constant volume ventilator positive pressure breathing, the motor is powered by a drive circuit controlled rhythmic output airflow through the suction tube into the animal lungs, lung expansion, in order to achieve gas exchange purposes.