The storage demand of all kinds of seed warehouses is met by improving refrigerating and control system of conventional cold storage and developing a new kind of lowering temperature and dehumidity equipment. The application result is satisfying. The paper presents the seed warehouses and storage conditions, emphasizes the improving and designing methods as well as temperature and humidity control principles, which both meet the demand of constent temperature and humidity with a highly controlled precision and lowering the cost of equipment and energy consumption.