关键词: 随机提前期, 供应链

Abstract: The（Q，r） inventory control model is important for inventory management, the variable Q and r are determined by the demand process and the lead time. But the lead time is often considered as a constant, and the different stochastic demand processes are often focused on. In the successive multi-level supply chain inventory model, the stochastic lead time is a critical factor effecting the collaboration between the successive echelons in supply chain. In this paper, we set a (Q,r) model based on stochastic lead time. In the model, we consider two cases:①the demand is a constant；②the demand is a stochastic variable.

Key words: stochastic lead time, supply chain, inventory