1, increase the transparency of the film. The use of a high-transmittance, non-ground film to timely clean the return and snow on the shed film can increase the light and increase the temperature of the shed. 2, improve the straw insulation. The straw curtains on the greenhouses are thick and strong. In order to improve the insulation performance, in order to prevent rain and snow from wetting the straw curtains in the deep winter season, the straw curtains can be covered with a layer of ordinary agricultural film or old film of Fangnian. 3, increase the insulation of the back wall. When constructing the back wall, a layer of bricks can be placed on the earth wall, or a hollow insulating wall can be built. Straw or polyphenylene foam boards can be filled in the wall. The effect is also very good. The cold wall can be directly constructed to facilitate warming. 4, outside the shed to dig cold trench. Dig 40-60 cm deep and 40-50 cm wide cold-proof ditch, fill with sawdust, weeds, horse dung, straw, and other insulation materials, and then cover the soil with ditch after practical to achieve the insulation effect. 5. Establish temporary heating measures. In the shed can be set to 2-3 heaters for 1600-2500 watt heaters, heater outlet direction not directly on the tomato can be inclined to the north wall, every 10-15 minutes to move a position. Smoke can also be used, but it should be noted that the inside cannot use charcoal or coal stoves to prevent carbon monoxide poisoning of people and plants. 6, hanging reflective screen. Hanging light curtains not only increase the illumination in the shed to promote the coloring of the fruit in the greenhouse, but also increase the temperature in the shed. The method is to hang a plastic film coated with a metal layer or tin foil on the inner side of the back wall. One meter is suspended every 2-3 meters. The suspension of the light curtain reduces the absorption of heat energy by the wall and can increase the temperature in the shed by 2-3 degrees. At the same time, it increased the illumination in the shed and promoted the coloration of the tomato fruit. We are a reliable manufacturers of Cosmetic Raw Materials in China; with advanced R & D and manufacturing in Skin Care Materials. With high-quality products of Cosmetic Ingredients, we can be a trust suppliers / factory. As a wholesale of Daily Chemical Material, we have the perfect after-sales service and technical support. Look forward to your cooperation! Cosmetic Ingredients,Sialic Acid,Ceramide Powder,Rhodiola Rosea Extract,Daily chemical Material Xi'an Quanao Biotech Co., Ltd. , https://www.quanaobiotech.com