Abstract: A multi-echelon inventory system that consists of a DC in central area and lots of retailers and suppliers is considered. To determine the inventory control policy of the DC, a multi-echelon inventory model is required for delayed ordering as a strategy to control the inventory level effectively. It is advocated that the DC and retailers are all controlled by continuous review (R, Q) policies for stock supply in installment; with the constant lead-time for replenishment and retailers when facing to stochastic demands. Under such conditions, the proposed model is developed to determine the reorder points and the ordering quantities for each inventory on the basis of backorder idea. An algorithm example is given to illustrate the possibility of this delayed ordering strategy.