Aiming at the dispersive supply chain consisting of one supplier and two retailers in a determinative market, it introduces the stock-holding relationship between the supplier and one retailer, upon which the ordering priority comes into being, and studies the impact of holding proportion on the supply chain and the performances of its members in a single period. The holding party's profit increasing with the holding proportion is also pointed out in a single period, while the held party's profit decreases with the holding proportion, and the influence on the profit of another retailer depends on the model of stock-holding. Furthermore, comparing the forward stock-holding model with the backward stock-holding model in several aspects, it proves that the backward stock-holding model is better than the forward stock-holding model.