The combined metal plate paddy granary for individual farmers was developed and the test of natural ventilation to reduce grain moisture was carried out during storage. The results showed that the granary had stable mechanical property, the function of mildew-proof, rat-proof and natural air drying was remarkable. It can effectively solve the problems including quantity loss, quality reduction, hygiene and safety. The purpose of increasing income and food safety, decreasing loss for farmers was achieved, which provided technical support for farmers to store grain safely.