The method of using quicklime mixed with soil to treat the top of the slope behind the greenhouse is very effective. It does not require covering with a thin film, which can prevent the reed planks on the purlins from getting damp and moldy after rainwater infiltration. Mix quicklime and soil in a 1:1 ratio at the top of the slope behind the greenhouse to make a mixed soil. Cover the slope behind the greenhouse with the mixed soil to a thickness of 10 centimeters and press it firmly. After this treatment, even the largest amount of rainwater will not leak. For the back wall slope of the greenhouse, there is no need to use quicklime treatment anymore. It can be covered with plastic film, because even if there are some small holes on the film in these areas, it will not be a big problem.