Abstract: In order to meet the higher requirements of the rapid development of intelligent railway for the real-time and security of railway application data mass transmission and computing processing, this paper studied the related concepts and basic framework of Mobile Edge Computing (MEC), and analyzes its key technologies and application scenarios, summarized the application solutions of MEC in intelligent operation, intelligent equipment, and intelligent construction scenarios, targeting the business needs of railway MEC, combined the current problems and looked forward to the technological trends of MEC's future development, provided assistance for improving railway intelligence.