Bulk grain categorized storage, is a modern grain storage technology with the aims to meet the requirements of optimal purchase, storage, and sales, guided by grain usage and quality control. The increase of high-quality grain supply represents the development direction of refined management in grain storage. The determination of the storage capacity of a single warehouse is directly related to the types, grain varieties, uses of grain, and quality control technology in the process of discharging the warehouse. Based on the analysis of the grain storage use, the problems existing in the sales and the acceptance capacity of customers, it is addressed that the size of the grain storage single warehouse for different grain varieties and different uses should be matched with the acceptance capacity of the sales destination. Under the existing technical conditions, the relevant opinions and suggestions were preliminary proposed on the appropriate single warehouse capacity scale, which could match the customer acceptance capacity, the grain storage quality control technology and the research on grain warehouse type.