The ball mill engineers in Henan Zhengzhou Mining Machinery had a deep analysis on the theme that how to improve the grinding effect of ball mill and shared some core technology of ball mill. The aim of the discussion about ball mill is to promote the rapid development of ball mill industry and realize energy-saving and high efficiency of ball mill industry. And eventually to let most of company to get profit from this activity about ball mill. The ball mill engineers think, the quality and material of slabbing of ball mil is the key of whether ball mill can work efficiently. We think the surface shape of the slabbing of ball mill in electric power plant and cement plant should be combined, with the reason of the remarkable change of material size from feeding end and output end of ball mill. Therefore, the moving style of grinding medium in ball mill will change from the feeding end and output end of ball mill accordingly. The change mode of the moving style of grinding medium in ball mill is decided by the the surface shape of the slabbing of ball mill. This is valuable experience proved by years’ experiments and practical operation of our ball mill engineers.