This book includes the revised selected papers presented at the CCF 18th International Conference on Service Science, ICSS 2025, held in Nanjing, China, during May 9-11, 2025. The 21 full papers and 11 short papers presented here were carefully reviewed and selected from 74 submissions. These papers have been categorized into the following sections: Service Recommendation and Discovery, Cloud Service and Edge Service, Machine Learning/Deep Learning Technologies for Services, Blockchain and Service Security, Service Systems and Applications.