Strengthen heat preservation. Vegetable farmers should pay close attention to the weather forecast in time and do a good job of heat preservation in the shed before the cold current comes. For example, in sunny days, the grass curtain should be exposed early and covered late to increase the light in the shed, which is conducive to heat storage during the day and heat dissipation at night. It is advisable to open the straw curtain and cover it early in cloudy night, and use the heating block to help raise the temperature. Operating line, such as rice husk or straw, absorbs moisture and keeps warm. In addition, special locations should pay attention to key heat preservation. Compared with other places in the greenhouse, the entrance, tuyere and front of the greenhouse have more opportunities to contact with cold air and have a long cold time, so extra heat preservation work in this area should be strengthened in low temperature season. The specific operation is to hang a layer of non-woven door curtain at the door of the greenhouse, and hang a layer of 2~3 meters of film along the back wall canal after entering the greenhouse, the height of which is the same as that of the hanging wire, so as to avoid the cold air from directly damaging plants. A windproof membrane is arranged below the tuyere to buffer and prevent cold air. The inside of the front is covered with film or the outside is covered with old grass or non-woven fabric. Strengthen heat preservation at night.