Abstract: Emphasize the service environment of coal water mixture（CWM） as well as its preparation methods and combustion state.To illustrate it’s environmental and economical,taking one CWM plant in Dongguan whose productivity is 106 tons per year as sample,introduce its investment from construction preparation,system configuration,factory layout.Analyse the operating cost from material,labor,power consumption and maintenance.Compare the CWM boiler with 10 t/h oil-fired boiler and 10 t/h chain coal-fired boiler from calorific value,sulphur share,boiler rated output,material consumption,investment and operating cost.At last,give some suggestions for the relevant national standards establishment.