Medium loss in coal preparation plant is generally divided into two aspects: management loss and technical loss. Management loss is generally more intuitive, mainly manifested in running, running, dripping, leakage, accident discharge, storage and transportation and other loss media; However, the influencing factors of technical loss are more complex and vary from factory to factory due to different processes. The technical loss is mainly manifested in the final product strip and the loss of magnetic separation tailings. In order to reduce the actual loss of interstitial consumption, it is necessary to analyze, investigate and control the factors affecting interstitial consumption.