In order to explore the influence of water droplets on the frostbite of fresh product,experiments were performed on water droplets with different masses.The cooling characteristics of water droplets were studied under a specific final pressure.Then the effects of vacuum pump displacement and final pressure on water droplets cooling characteristics were studied.The results show that the cooling law of droplets cannot match well with the reported cooling law of food.The temperature of droplets decreases rapidly without boiling.Changing the water mass and vacuum pump displacement cannot prevent water droplets from freezing;the temperature will be lower than 0 ℃ if the final pressure goes down to 3 500 Pa,and droplets will freeze if the final pressure is lower than 2 000 Pa.So water should be sprayed to the surface of fresh product evenly.The final pressure should be raised appropriately with the increase of spraying water for avoiding frostbite.