With the change of edible oil consumption pattern from bulk to packing oil and the development of logistics industry, the construction of small and medium-sized edible oil packing plant is developing rapidly, due to the packaging plant's geographical location, processing scale, product types, goods turnover rate and logistics conditions are different, the design of the warehousing scheme is also different. By analyzing all relevant factors affecting the storage capacity and combining with the inherent characteristics of building workshop design, discusses the design parameter input conditions, reveals the general rules that can guide the design application, and constructs the theoretical calculation model of minimum storage capacity under specific conditions. Based on the superposition of the model with the common variables that are constantly changing in the actual production operation, the deviation of the real state from the theoretical model is corrected by introducing the turnover rate, and then a simple formula is derived to provide a reference for the design.