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The electric ears listening, bearing clearance, oil pressure, vibration load power, pressure difference and other loading measurement method of mill can,t really solve the bulging problem. Program is innovative use of laser range finder. At the slurry discharging port, laser light at the machine surface elevation ranging along the axis of the cylinder body. According to the machine aggregate 3D motion morphology, program designs to obtain the measurement method of stable load corresponding relationship between quantity and material high between static and dynamic. It set the filter principle to exclude interference of material rain. Program realizes the direct measurement of material of mill, and lays the foundation for energy saving and consumption reduction of grinding operation.