Under the condition of capital constraint on retailer, the retailers can effectively alleviate the funds shortage by delay payments and financing to third party financial institutions. This method will improve the profit of retailer and the performance of the csupply chain. Newsboy model under conditions of permissible delay payments, considers the capital structure of the company in the study of financing problems, and research two-stage supply chain system consisting of suppliers and retailers. An optimal order strategy model of the retailer is constructed, and the Analytical solution of this model is obtained. Then, this paper obtains a series of useful management conclusions through sensitivity analysis.