A centralized system of vendor managed inventory(VMI) and third party logistics(TPL) is brought into cluster supply chain in this paper and an integration management model of a three-level supply chain which consists of n vendors,one dominant TPL and one retailer is set up.First,aiming at to minimize the transport cost,the relationship of single transport cost and single transport batch is considered and the batch decision making of two replenishment modes that the TPL pickup goods from various suppliers re...