Abstract: Considering a dual-channel supply chain composed of a single leading manufacturer and a single retailer, and the government's decision to subsidize the manufacturer's social responsibilities for the purpose of maximizing social welfare, a study is conducted on the impact of government subsidy ratios and manufacturers' misreporting factors on the supply chain and social welfare under centralized and decentralized decision-making. The study finds that the corporate social responsibility effort level and maximum social welfare in decentralized decision-making are always lower than those in centralized decision-making; the optimal government subsidy ratio in decentralized decision-making is higher than that in centralized decision-making; the combination contract of cost sharing and revenue sharing can achieve perfect coordination and Pareto improvement of the dual-channel supply chain.