The reasons for the high material level in the vertical roller mill are as follows: first, the reduction of water material ratio reduces the carrying capacity of water, resulting in the increase of material level in the mill; Second, the inlet material diameter is too large, which increases the residence time of the material in the vertical roller mill, resulting in too high material level in the vertical roller mill.In order to ensure the stable and efficient operation of the equipment, in addition to selecting the type of equipment in line with the beneficiation process, daily maintenance and repair are particularly important.Therefore, it is recommended that the mine owners consult the equipment manufacturers with the qualification of the overall concentrator when selecting the vertical roller mill, and select the equipment suitable for their own process flow, so as to fundamentally ensure the production efficiency and economic benefits of the whole concentrator.