This article explores the widespread and practical application of computer operating systems in the field of transportation and communication security, emphasizing the key role of operating systems in resource management, process management, memory management, file system management, device management, interrupt handling, and security. Computer operating systems play an important role in the field of communication security, effectively resisting various network threats and ensuring the security and stability of information. In transportation and communication security, operating systems provide important guarantees to ensure the safety and reliability of communication systems. By implementing a series of security measures, such as user authentication, multi-factor authentication, access control, strict security auditing, and patch management, malicious attacks and data leaks can be effectively prevented, ensuring data security in the transportation and communication industry. The article also introduces the application of UOS system in the field of transportation and communication. The system adopts an autonomous operating system, ticketing terminals, servers, middleware, databases, etc., realizing the independent software and hardware platform of the entire ticketing application. It has successfully passed the pilot verification of the entire ticketing process, breaking the long-term monopoly of foreign systems such as Windows and CentOS.