It plays a significant role in promoting the high quality and good price of grain in modernization of grain circulation. Based on the management and industrial development demand of policy grain, this paper studies the trends of change of policy grain in the stock period, analyzes the main influencing factors of the policy grain on auction price, and decomposes the quality factors into four kinds of variables. This paper also quantifies the relationship between quality index and price, as well as constructs a analysis framework and prediction analysis model of policy grain on the relationship between quality and price, for the purpose of promoting the close relationship between policy grain quality and price, and establishing a more scientific and effective grain price formation mechanism.