Based on the questionnaire survey data and empirical research of 600 postal express users, the structural equation model is to evaluate and analyze customer satisfaction with postal express service from four aspects: acceptance service, delivery service, post-sales service and service quality. The results show that acceptance service and post-sales service have a direct positive impact on customer satisfaction, and delivery service has an indirect impact on customer satisfaction through post-sales service and acceptance service, and there is a two-way relationship between acceptance service and delivery service. This indicates that each customer satisfaction evaluation index is correlated with each other, and the improvement of a single ability index may not directly improve the customer satisfaction of postal express service. According to the results of the empirical study, it is suggested to strengthen the management of receiving and sending services, improve the quality and efficiency of receiving and sending services, strengthen the management of delivery services, improve the quality and efficiency of delivery services, strengthen the post-sales service management, optimize the customer service acceptance process and response speed, continuous improvement and innovation, and continuously improve the service.