n vacuum cooling, pre-cooling water, ice water pre-cooling and so on.Pre-cooling is a very effective method that rapid elimination of field heat and the hot breath of fresh fruits and vegetables after harvest, so that fresh vegetables physiological activity slowing, inhibiting fungi and other microorganisms multiplyor itself overgrowth (such as asparagus overgrowth will bent, broccoli will bloom) and reduce its moisture loss (weight loss) and a variety of circulation losses, enabling consumers t