Keynote Speech -- Session 1: Sensor Networks I -- Session 2: 3G/B3G Networks -- Session 3: Peer-to-Peer Systems -- Session 4: Caching and Routing -- Session 5: Wireless Networks -- Session 6: Multicast I -- Session 7: Ad Hoc Networks I -- Session 8: Algorithms I -- Session 9: Security I -- Session 10: Peer-to-Peer Systems and Web Service -- Session 11: Multicast II -- Session 12: Traffic and Network Management -- Session 13: QoS I -- Session 14: Ad Hoc Networks II -- Session 15: Routing -- Session 16: Algorithms II -- Session 17: Security II -- Session 18: Internet Application -- Session 19: QoS II -- Session 20: Security III -- Session 21: TCP/IP and Measurement -- Session 22: Algorithms III -- Session 23: Sensor Networks II -- Session 24: Design and Performance Analysis -- Session 25: Traffic and Network Management II -- Session 26: Agent-Based Algorithms -- Session 27: Security Algorithms.Welcome to Zhangjiajie for the 3rd International Conference on Computer Network and Mobile Computing (ICCNMC 2005). We are currently witnessing a proliferation in mobile/wireless technologies and applications. However, these new technologies have ushered in unprecedented challenges for the research community across the range of networking, mobile computing, network security and wireless web applications, and optical network topics. ICCNMC 2005 was sponsored by the China Computer Federation, in cooperation with the Institute for Electrical and Electronics Engineers (IEEE) Computer Society. The objective of this conference was to address and capture highly innovative and stateof-the-art research and work in the networks and mobile computing industries. ICCNMC 2005 allowed sharing of the underlying theories and applications, and the establishment of new and long-term collaborative channels aimed at developing innovative concepts and solutions geared to future markets. The highly positive response to ICCNMC 2001 and ICCNMC 2003, held in Beijing and Shanghai, respectively, encouraged us to continue this international event. In its third year, ICCNMC 2005 continued to provide a forum for researchers, professionals, and industrial practitioners from around the world to report on new advances in computer network and mobile computing, as well as to identify issues and directions for research and development in the new era of evolving technologies.