The invention relates to an operation service management system of an IT system, and belongs to the technical field of IT operation and maintenance. The operation service management system comprises a foreground module and a background module, the foreground module comprises a server unit and a user view unit, the user unit logs in a user request in the system and tracks the user request subsequently, and the background module comprises an operation flow unit, a knowledge base unit and a management unit. The operation flow unit includes event management, problem management, change management and publishing management; and the management unit includes service requests, plan tasks, duty management, report management and asset management. The operation service management system of the IT system has the advantages that unified IT operation management of an enterprise is realized, and four major flows including event, problem, change and publishing are managed; and IT operation maintenance and management are automatic, the maintenance efficiency is improved, the maintenance cost is reduced, and working and operation efficiency of the enterprise is improved.