Influence of materials on vertical roller mill grinding efficiency is mainly reflected in material properties and grinding particle size.Different ores have different properties and hardness, and the corresponding grinding process should also be different. For example, fluorite, tin ore and other ores that are easy to be crushed are different from other ores.Attention should be paid to over grinding in ball milling. The coarser the grinding particle size, the longer the time required for grinding to the separation stage, and the greater the loss of grinding equipment.At present, more crushing and less grinding is one of the main principles of concentrator design and production. For ores of the same nature, the higher the content of fine particles in the grinding products, the higher the grinding efficiency.