The invention relates to an active preservation package of grain, comprising preservative film bag, gas modifier, and grain products. The film bag is polyethylene (PE) or polyvinyl chloride (PVC), the most suitable ventilation ratio Rho0 (CO2:O2) of carbon dioxide to oxygen is 1.3-7.0; main ingredients in small bag of gas modifier are malic acid, sodium bicarbonate, silica gel, calcium stearate, starch, and so on; the concentration of oxygen is controlled below 2%, while the carbon oxygen is controlled in the range of 50%-80%. Using the invention, the rice can be preserved in the active preservation bag for 9 months at normal temperature, without insects and mildew. The quality indexes of fatty acid, total acid, reducing sugar, viscosity, etc. are obvious better than the contrast (general preservation). The taste can be kept as the flavor of fresh rice with total loss smaller than 1%.