Considering logistics service and marketing effort level and other factors, a supply chain game model including cross-border e-commerce enterprises and cross-border logistics enterprises is constructed. The results show that the transaction volume, logistics service level, marketing effort level and supply chain profit under centralized decision-making mode are higher than those under decentralized decision-making mode. In order to realize pareto improvement, a logistics service cost sharing contract is designed, and the effectiveness of the con? tract is verified by an example. Logistics service cost sharing contracts not only effectively improve trading vol? ume and supply chain profits, but also improve the level of cross-border e-commerce enterprises’marketing ef? forts, and better encourage cross-border logistics enterprises to improve their logistics service level.