Abstract: Product leasing service was studied considering the servitization conducted by many manufacturing enterprises aiming at identifying the optimal selling period and the best proportion between two kinds of product, i.e., the sellingproduct and the leasingproduct. Furthermore, a model maximizing the total profit considering the inventory holding cost, backorder cost, product depreciation expenses, etc is formulated. During the derivation of the best solution, some important properties can be obtained: there always exists the optimal proportion between the amount of sellingproduct and leasingproduct given the selling period in order to maximize the total profit, and vice versa. Results of numerical experiments and parameter sensitivity analysis shed light on management: manufacturer′s optical marketing strategies are affected by demand rate of leasingproduct and price of sellingproduct. And also, manufacturer should keep a reasonable amount of leasing product when panning to carry out the leasing service.