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1, cover protection law. For shading net reinforcement, reduce the cold wind directly invade seedling shoots. Iron bars, bamboo sheets, etc. can also be used to support arches on seedbeds, covered with plastic membranes to form small arches, and surrounded by soil. If the temperature falls below 0°C, consider covering the grass mats with plastic canopies. Cold insulation effect. 2, irrigation antifreeze method. When water is poured before the onset of the cold current, the temperature can be stabilized and the moisture during the wintering of the seedlings can be supplied, effectively preventing dryness. 3, smoke and cold. In order to stack the branches, wet firewood, etc., cover 8 to 10 CM thick soil layer, make a height of 1.0M ~ 1.5M, the bottom diameter of 1.5M ~ 2.0M cigarette, no fire when burning. 4, spray potassium fertilizer and antifreeze. The use of special antifreeze for seedlings to prevent freezing will help to protect the seedlings. In the September and October, the cold-resistant exercise of the seedlings will be started. A single application of 1,000 times potassium dihydrogen phosphate or high-level phosphorus and potassium fertilizers will be applied once every 10 days for three consecutive times to enhance seedlings. The degree of lignification improves cold resistance to cold waves in autumn and winter.