Among many milling processes, LM series vertical roller mills, MTW series European type grinding mills and TGM series supper pressure trapezoidal mills are recommended for the milling process in limestone powder making. The LM series vertical mill is developed based on the application experience of domestic and foreign vertical mills and absorbs foreign technology. It has the functions of energy saving, drying and grinding. The MTW series European type grinding mill has a high market share in the current market. TGM series supper pressure trapezoidal mill is the star product of similar equipment in China.