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This paper investigates the gap between qualitative and quantitative constraints in spare parts stock control,with specific reference to warship spare parts support projects.A critical literature review of theoretical contributions about qualitative or quantitative factors for warship spare parts warehouse management is firstly provided,which allows to analyze the reasons for this qualitative-quantitative gap by addressing the limitations of spare parts models developed in the literature.Therefore a model including cloud model,marginal analysis and Lagrange multiplier method (CML) for study is proposed in this paper to bridge the gap.The model is used to solve the mix-constraints (both qualitative and quantitative constraints are considered) problem in a logic decision diagram particularly at the different decision nodes of the diagram.Finally,verifying test results show that the algorithm is feasible and its optimal support project meets the needs of engineering practices.