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First, preventative measures: 1. During germination low temperature treatment. During seed germination, according to the lowest temperature that different vegetables can bear after the seeds germinate, low temperature treatment can greatly improve the cold resistance of vegetables in deep winter season. 2. Grafting for roots. By changing the roots, the cold-resistance of the root system can be greatly improved and the hazards of disaster weather can be avoided. 3. Increase organic fertilizer. The heat capacity of the soil, buffering the cooling brought about by the heat loss of the cloudy days, can also promote the root system to improve cold resistance. 4. Reasonable water use. It is very important to control the water moderately before winter to reduce the relative humidity of the indoor air, and at the same time, to create an environmental condition where the bottom is damp and the topsoil is dry. Second, the process of management: 1. Lien snow covered the grass. When the snow does not fall on cloudy days, you must uncover the grasshoppers and fight for precious scattered light. Cover an hour earlier than sunny weather. 2. Look at the temperature management. In the case of cloudy days, the photosynthesis of vegetable crops is very weak, and the photosynthetic products synthesized are few. In order to reduce respiratory consumption, the temperature must be lowered. The nighttime is generally 2-3 degrees Celsius lower than the sunny days. 3. Ventilate at noon. In the case of continuous snowfall, the respiratory depletion is greater than photosynthesis, and greenhouse gases will accumulate a large amount of harmful gases such as carbon dioxide. Therefore, for three days or more in cloudy days, the top wind should be released for 1-2 hours at noon. Third, the management after the sunny days: In the continuous cloudy days for many days, once the storm, after uncovering the grasshopper, the temperature at room temperature rises quickly, the vegetable evapotranspiration suddenly increases, while the ground temperature is low, the root activity ability is still weak, Transpiration cannot be replenished, and the leaves will soon appear wilting. Therefore, we must pay attention to observing the storm after sunny days, and find wilting. Immediately put down the grass and reopen it before reopening it. After several iterations, we will not unravel it and then uncover all. The next day should also pay attention to observation, and if there is wilting, we should also look back. Generally after three days can really be assured.