In addition, the wear phenomenon of lining plate is also related to the wear resistance of steel balls. During ball sliding, the friction between lining plate and steel ball will increase, and the friction will increase with the hardness of the ball. It will not only cause damage to lining plate, but also very likely cause safety accidents, causing vertical roller mill damage and even threatening the life and safety of operators.In addition, in practical applications, it is found that the size and elevated height of the steel ball will also have a different effect on the liner. The larger the diameter of the steel ball, the higher the elevated height, the greater the initial speed and the greater the impact force produced by the steel ball during rollover. Therefore, the worse the wear caused by the larger steel ball is compared with the smaller diameter steel ball.Relevant staffs need to make proper allocation of the number and size of steel balls, balance the relationship between efficiency and safety, and avoid the occurrence of liner breakage and grout leakage.