Abstract: Through the organic integration of three typical railway detection methods, which were network security classified protection evaluation, risk assessment and security inspection, this article studied the establishment of railway trinity network security evaluation system, focusing on how to achieve efficient evaluation.The establishment of railway network security evaluation index database was the key and basic step to solve the above problems. The index library mainly included general indicators and special indicators. According to the network security level protection 2.0 standard, the general indicators were sorted out the general security indicators, cloud expansion indicators, Internet of Things expansion indicators, mobile Internet expansion indicators and industrial control expansion indicators.The special indicators were focused on business security and sorted out the evaluation index of important railway systems from the perspective of integrity, confidentiality and availability evaluation index.The special index and network security evaluation index database of transportation dispatching management information system are the basis of onsite evaluation, which has practical significance.