Abstract：In order to improve production capacity of semi-autogenous mill, the simulation model of SAG was set up.Influence regularity, caused by rotate speed, the numbers of lining board and height of lining board, was obtained.Using the prototype, the experiment studied the useful power by analyzing rotate speed, the numbers of lining board and height of lining board.it was proved that the influence regularity obtained from simulation was similar with experimental result that the rotate speed was 0.8, the number of lining board was32 and height of lining board was 8 mm.The conclusion can provide theoretical reference for production.

Keyword：semi-autogenous grinding machine (SAG) ;grinding performance;discrete element method;numerical simulation;