Abstract: The paper emphasizes particularly on the two problems of solving ship Multi-level stores spare parts calculation : ( 1 ) In order to resolve calculation problems for recurrence and recursion of muhi-level stocks P (probability of spares sufficiency) and MLDT(Mean Logistics Delay Time), compile the simulation algorithm procedure based on graphical interfaces, and provide a convenient and practical calculation tool for the equ uipment supplier; (2) Put forward the stores variety integration estimation model based on many sorts of influence factors, and resolve the fixed quantity calculation problem which is suitable for the store spare par rts variety of certain probability of sufficiency in the given supply levels.