There are many problems in a extruding unit,such as many monitoring location,heavy workload of offline analysis and long timeconsuming analysis,which seriously affect the timeliness of monitoring.In view of these problems,the application of realtime monitoring technology of wear in this extruding unit was discussed.The hardware and software composition of the realtime monitoring system of wear were introduced,as well as the onsite installation of the realtime monitoring system and the design of lubricating oil pipeline of the monitoring system.The field operation results show that the realtime monitoring technology of wear can find the deterioration of oil performance and water pollution in the system in time.It provides timely and accurate technical support for the predictive maintenance and active maintenance of the equipment