Based on the supplier repurchase contract and the revenue-sharing contract, this paper establishes a supplier decision-making model under the government's differential subsidy of supplier repurchase costs, and explores the influence of the government's differential subsidy on the wholesale price of suppliers and the order quantity of retailers. Studies have shown that under the condition of government subsidies, the optimal order quantity of retailers in the supply chain under decentralized decision-making has increased significantly; under centralized decision-making, the overall expected profit of the supply chain has increased significantly. Under the revenue-sharing contract, only when the government subsidy ratio is within a certain range, the retailer will have the optimal order quantity, so as to achieve the coordination of the supply chain.