In response to the 5G application requirements of Dalian University of Technology City College, this paper designs a dual-domain Dedicated Network Name (DNN) private network planning scheme based on "5G+Education". Users can independently apply for 5G private network services through online and offline channels, achieving seamless access to both on-campus and off-campus resources, and significantly enhancing the user experience. Through the dual-authentication and information synchronization mechanism between the users-5G RADIUS and the telcos-5G RADIUS, real-time, automated, and refined management of 5G private network users is realized, ensuring that users can access resources securely, reliably, and traceably at different privilege levels. The integration of 5G RADIUS with the campus-wide identity management platform has enabled unified collection and traceability management of internet usage and data traffic, greatly improving the efficiency and transparency of network administration. By integrating campus network authentication with 5G technology, this plan aims to create a 5G campus private network for City College, enabling campus users to access the internal network securely from anywhere and at any time, and also providing theoretical references and practical guidance for other universities in the construction of 5G private networks.