Supply chain finance with a distributor and a core enterpriser is considered based on Buy Back Guarantee. Underthe assumption of random demand, the expected profit models of the distributor and the core enterpriser are built to get the optimal ordering level and the optimal wholesale price. Sensitivity analysis of the optimal ordering level is obtained about the wholesale price, the initial funds and the salvage of the products. Then, the comparison of the optimal ordering level is made among the different financing mode — trade credit and the buy back guarantee contract. Finally, numerical analysis illustrates the effectiveness of the proposed models.