Since the instability of the rice quality during the storage, the temperature in large warehouse stored bulk paddy with high moisture content was controlled by air-conditioner. The average temperature of the top-layer was controlled below 20 ℃ to create low-temperature storage environment which effectively stopped the temperature rise, inhibited the propagation of pests and mildew, reduced the storage pollution, stabilized the grain quality, decreased the moisture loss and therefore improved the economic and social benefit.