Which milling process is used is the key to the success of the desulfurization project. Among many milling processes, LM series vertical mills, MTW series European version mills, and TGM series overpressure trapezoidal milling limestone mills are recommended for the desulfurization milling process in power plant steel plants. 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.