The arch sheds are vented from the lower part of the perimeter to ventilate and cool down. In order to prevent insects outside the shed from entering the shed, pest control nets are usually installed around the sheds. Generally, the agricultural film on both sides of the arch shed is raised 50-60 cm high and replaced with a pre-prepared pest control net. This can form a “dance†in the arch shed, which can reduce the temperature and humidity in the shed. Effectively prevent pests from entering. However, in the rain, the arch shed with a relatively low topography can easily inject rainwater from vents, causing serious diseases. Some vegetable farmers choose not to remove the film when it rains. This can really prevent rainwater from entering, but the heat and moisture in the shed can't be distributed. It's far from enough to let the wind down at the top. Recently, in the greenhouse of a vegetable farmer in Weijia Village, Jitai Township, Shouguang City, Shandong Province, I saw him wrapping a layer of agricultural film on the edge of a relatively low-profile arch shed. 20 cm, and then install the insect net according to the size of the vents on both sides. According to the description of the vegetable farmer, insect nets are generally 1.3 meters wide. This will not only prevent the rain from pouring into the shed, but also prevent pests from entering the shed. It will also effectively ventilate and improve the shed's small environment. In addition, this layer of agricultural film does not have to be removed in the winter, but also play a certain role in insulation.