The 5G bearer network carries a large number of high-value services and plays an important role for China Mobile. However, 5G bearer network troubleshooting faces the following challenges: frequent faults, a large number of faults, difficult fault locating, and high requirements on troubleshooting time. The service process of this project is centered on AI Agent to implement automatic monitoring and diagnosis of root alarms and implement automatic diagnosis instead of manual operations in common fault scenarios. If a fault outside the scenario needs to be manually diagnosed, experts can perform comprehensive diagnosis based on the information provided by AI Copilot.