Abstract: In order to investigate the effects of vibration, noise and mass of portable pneumatic extinguisher on physiological and psychological loads of operators, we measured the handle vibration and parotic noise while using portable pneumatic extinguishers (6MF-30 made in China and HB2302 made in Japan) in the experiment, and had an ergonomics evaluation using heart rate and reaction time. The experimental results indicated that the vibration acceleration, parotic noise, increasing ratio of heart rate and reaction time with 6MF-30 were larger than those with HB2302. The parotic noise increased as vibration acceleration grew. Vibration and noise jointly exerted an effect on the operator, and it was difficult to distinguish between them. Therefore, we classified the combined action of vibration and noise as one affecting factor, which obtained good analytical results. The effects of mass and vibration-noise on increasing ratio of heart rate were significant, while not so on reaction time. The effect of mass on heart rate and reaction time was greater than that of vibration-noise. We suggest that 6MF-30 should be redesigned, which focuses on the reducing mass, vibration and noise, for example, selecting an engine with moderate power and light mass and using the plastics as main materials for handles.