Abstract: The prospect and preliminary study on applying glass transition theory to grain drying and storage were discussed in this paper. Based on the glass transition theory, the glass transition temperature of grain, the change of drying characteristics and physical state in the process of grain drying and storage were analyzed. The glass transition temperature decreased with increasing moisture content of biomaterial. The grain involves transition from a solid “glassy” to a liquid like “rubby” state during drying. The reasons for quality changing and the methods of controlling the degradation of quality were also discussed.