Based on logistics theory and borrowed ideas from logistics model inventory management, an ore logistics model of underground mine was built, and an analytical method which could be used to determine pass system storage capacity was proposed. Simulating real ore transfer process in underground mine mining system, ore input and ore output function of pass system were built, and real-time ore quantity in pass system was graphed. Through comprehensively analyzing the figure of real-time ore quantity in pass system and practical mining production, rational pass system storage capacity was calculated. Combined the practical ore transfer process of panel under level 1470 in Yunnan Tin Company Laochang tin mine number 13-8 ore cluster, storage capacity of pass system in panel is calculated which provided reasonable basis for pass system design in underground mine, and improved the reliability of mine engineering design.