This is usually caused by high temperatures in the booth and high humidity. If the film for the greenhouse is film-free, the fog should be smaller or not even. To eliminate fog in the shelter, there are generally the following methods: when the weather is good, ventilation and ventilation, when the ventilation at any time to observe the temperature and humidity inside the greenhouse, to prevent sudden temperature drop frostbite vegetables; increase the amount of greenhouse light; reasonable watering, strict control of pouring The amount of water should be properly ventilated after each watering and the soil should be loosened in time. Finally, the readers were provided with a method that was commonly used by local farmers and was very effective: the bean was beaten into bean curd and sprayed onto the shed film. A medium-sized shed used about a pound of beans and two sprayers of water to spray on the inside of the greenhouse membrane.