This paper introduces the integrated design and innovation of the drainage system of grain depot.On the basis of the previous drainage system,by changing the material,integra-tion degree,working conditions,outflow direction and other conditions,improving the quality and efficiency of rainwater discharge design in the reservoir area can better protect the food secur-ity in the grain depot,greatly improve the management efficiency of the grain depot,and improve the ability to cope with a variety of bad weather.