Abstract: In order to realize the real-time monitoring and measuring the leakage of the emulsion liquid in the hydraulic system of the fully mechanized coal mining face, a test of the relations between the emulsion liquid pressure and the leakage fault was conducted and the different variation laws of the pressure curves under the normal liquid and two leakage status were obtained.According to the difference of the pressure curves under the two different conditions, with the BP neural network ap plied to distinguish the operation status of the hydraulic system, the MATLAB toolbox was applied to the study on the simulation distinguishment and the simulation resu lts and the predicted effect could be fully fitting. Taking the monitoring and measuring of the emulsion liquid pump station in No.2303 fully mechanized coal mining face 0 f Zhangcun Mine as a case, the PLC processing unit and the remote monitoring and measuring system were applied to the real-time distinguishment on the operation C onditions of the hydraulic system.The site applied effect was excellent and the reliability of the hydraulic system in the coal mining face was improved.