Abstract: Acording to a igh difcutreconstuction of the flue dust utra low emission technology of the coal-fred power unit. igh risk and reconstruction resultshard to reach the predicted efct and other problems ,the paper analzed the techicalfeatures ofthe dr electric dust colctorrotating elecrode wet electic dust c llctor.igh frequency electic power.1ow temperature coal saver and high efcient dust removal and desufurzation system in the coa-fred reconstruction techical routeof the coal-fired ulra low emission.T7he paper provided the proposals on the suiable appictatio scope and improvement die ction ofthe vet electric dust cllector.A system atic state was conducted on the noted itens ofthe design,manuifacturing constouction.operation,montoring control and other aspects of the reated equipment.Thepractices showed that afer th ulra low emission reconstoucton of the coal-red power generation unithe fow dust content could met the emission standard of the gas-fred power plant,the f1ov dust measured value could be wellfited with the load variaton tendency of the power unit and could furher approve the reliabity of the ultra low emission flow dust data.