The invention provides an IT-service concentrated monitoring and managing system based on the Apriori algorithm. The IT-service concentrated monitoring and managing system is characterized by comprising an IT-service concentrated monitoring and managing unit and an IT-service-concentrated-monitoring-system core process unit; the IT-service concentrated monitoring and managing unit comprises an IT device state data collecting module, a state alarm trigger module and an operation-and-maintenance-event processing module; an IT-device-state-data concurrent collecting process, a state-alarm-rule diagnosis process and an alarm-correlated-event positioning process are adopted in the IT-service-concentrated-monitoring-system core process unit. The Apriori algorithm calculation is carried out with WEKA software, all kinds of data mining tasks can be borne, and include data pretreating, classifying, returning, clustering and correlation analysis to complete the task such as server-terminal automatic data mining, the operation performance is better optimized, design is novel, and the IT-service concentrated monitoring and managing system based on the Apriori algorithm is a quite-good design scheme.