The humidity of the air in the solar greenhouse is often greater than the exposed ground and is in a state of excessive humidity. Therefore, the air humidity management in the solar greenhouse is mainly dehumidification. The dehumidification measures in production are summarized as follows: (1) Ventilation, ventilation, and dehumidification Ventilation is a good way to reduce humidity. Ventilation must be done at high temperatures, otherwise it will cause the room temperature to drop. If the temperature drops too quickly during ventilation, close the vents in a timely manner to prevent a sudden drop in temperature and damage the vegetables. (2) Rational watering Watering is the main factor that causes indoor humidity to increase. Winter and spring production can choose sunny gutters or ramets watering, film cover can be used under the film dark irrigation. Watering should strictly control the amount of water, to prevent indoor humidity is too high. After each watering, the air is properly ventilated, and timely slashing of loose soil can reduce soil moisture and reduce air humidity. (3) Covering the plastic film with plastic film can reduce the evaporation of soil moisture, which is an important measure to reduce indoor air humidity. For example, in the solar greenhouse, large and small ridge distances and double ridges are used to cover the mulch. When water is poured, water flows into the small ridges under the mulch. The mulch prevents the evaporation of moisture, which also prevents the humidity of the air in the shed from being greatly increased. (D) Temperature increase and decrease humidity This method can meet the temperature requirement of vegetables and reduce the relative humidity of air. When the plants grow to have resistance, the watering canopy is heated to about 30°C for 1 h, and then ventilated and vented. After 3-4 hours, the humidity in the shelter can be repeated less than 25°C. (5) Adopting heat-insulating material with good hygroscopicity The material of the heat-insulating curtain with good moisture permeability and hygroscopicity, such as non-woven fabric, can prevent condensation on the inner surface and prevent dew from falling on the plants, thereby reducing the air humidity. (6) Natural hygroscopicity It is possible to use rice straw, wheat straw, quicklime and other materials to spread water vapor or fog between the rows to achieve the purpose of dehumidification. (7) Intertillage dehumidification By cutting off the soil capillary tube, soil capillary water can be prevented from rising to the surface layer, and large amounts of soil moisture can be avoided. (8) Increasing the amount of transmitted light Increasing the amount of transmitted light can increase the room temperature. After the room temperature increases, ventilation and air exchange are often performed to achieve the purpose of dehumidification.