Compared with ordinary commodities, grain is a kind of special commodity. This paricularily reflects in the aspects as production, circulation and consumption etc. The non-continuity and weak controllability of grain production objectively increases the non-smoothness of grain output and supply costs. Rigid demand determines that the grain demand side has a strong degree of stability. The inconsistency between the fluctuation of production side and demand side increases the risk of fluctuation in the grain market. The cost of circulation relatively high due to the perishability of grain further amplifies the range of the fluctuation of grain price. The special product attribute of grain determines the necessity of establishing grain reserve. The establishment of the grain reserve system is essential not only for the stability of the grain market in the region, but also the stable operation of the region's economy and society.