The cleaning of evaporator coil scar is a difficult work of production in the a-luminium plant. Because some problems existed in the conventional cleaning methods,thehigh-pressure water jet.Technology has been used for the scar cleaning.The results haveshown that the cleaning of scar is quick,with good quality.This method is very effective.This paper describes the test and results of evaporator coil scar cleaning with high-speedwater jet in aluminium plant,including the assessment of test results.