2025 9th International Conference on Communication and Information Systems (ICCIS 2025) will be held in Shenzhen, China during October 31-November 02, 2025. The conference is co-sponsored by Southern University of Science and Technology, China, technical supported by Chongqing University, Nanjing University of Posts and Telecommunications, and so on. ICCIS 2025 aims to provide a platform for researchers, academics and industry professionals to exchange ideas and present their latest research findings in this rapidly evolving field. The conference will cover a range of topics, including wireless communication systems, information theory and coding, and network security and privacy, among others. By facilitating collaboration and knowledge-sharing, ICCIS 2025 will play a critical role in shaping the future of communication and information systems.