Recirculation ventilation system under film was installed in the test warehouse, and the axial flow fan was intelligent controlled. When the weather was wet and cold in winter, it would be ventilated with small air volume and slow speed. But when the upper layer grain temperature reached higher than 20 ℃, recirculation ventilation system will be started up to equilibrate the temperature in grain heap; when the temperature exceeded 25 ℃, the axial flow fans were started by the intelligent control system to remove heat accumulation. By adopting the technical process, grain temperature was controlled and grain moisture was kept in the test warehouse. In the test warehouse the grain moisture reduced 0.5 % compared with the control warehouse after storage for 3 years.