关键词: 批量决策, 翻新, 制造, 延迟交货, 质量, 服务水平

Abstract: To determine the optimal manufacturing & recovery policy, a system including manufacturing & recovery was investigated. The inventory decision-making models on the unit time total cost related to lot-size decision-making were formulated under（1, N）and （M, 1） policies respectively, and were reduced to the functions with respect only to the setup numbers of manufacturing or recovery by the elimination theory. Differencial function was used to solve these models. Finally, formulae on the optimal setup numbers of manufacturing & recovery and other decision variables were derived. Numerical example shows that the optimal manufacturing & recovery policy could be found by manufacturer, and sensitivity analysis of the recovery rate indicated that manufacturer tended to use the（1, N）policy when the quality of return used products was above normal, otherwise, the（M, 1）policy was preferable.

Key words: lot-size decision-making, recovery, manufacturing, backorder, quality, service level