the using high voltage direct electric field to purify the flue gas.which contains silt particle.is called static-electricity duster technique. this technique can control air-pollution and reclaim valuable dust. static electricity dustrt technique began to appy in industry field from twentieth to thirtieth century. with the rapid developmeng of energy industry and building lots of coal-burning heat power stations the great number of flue gas is drained out. flu gas. which contains pollutant and dust. causes seriously pollution of air. ahd bings extremely damage of human healthy. so people mor and more pay attention on curing the air pollution with superiority difference between the electrical duster and machinery duster (gravity serrling centrifuge . lavation、filter and so on) is that the former duster enforce the power of dust settling only to exert on dust itself .but the latter duster enforce the power of dust settling to exert on whole air current . so this technique is popular with the profession of electric power(heating).metallurgy(rclaim heavy metal).chemical engineering . building material(cement)、making paper ect.