Suppliers’ buy-back guarantee can prompt the risk-averse bank to boost the loan limit to capital-constrained retailers, which can enhance the  purchasing power of retailers and increase the performance of supply chain. The optimal operational and financing strategies of retailers were studied, and the impact of the  risk averse degree of the bank and the  buy-back price of the supplier on the decisions of the supply chain were analyzed under the  downside risk control of the bank and the buy-back guarantee of the supplier. It is shown that the  downside risk control of the bank is equal to the loan limit control and the loan limit is increasing in the buy-back price of the supplier. It is also shown that there exists a threshold about the buy-back price such that the  ordering decision of the retailer is influenced by the  risk control of the bank only when the buy-back price of the supplier is lower than the threshold. Finally, the numerical study was given to analyze the optimal pricing problem of the supplier.