Abstract: After an investigation in the influences of Ca and Mg on the determination and making choice of appropriate working condition for the instrument, a direct determination is made for Cd,Cr,Cu,Ni,Pb and Zn in environment water samples by ICP AES. An analytical method is proposed to determine the six trace elements in environment water samples by ICP-AES, by means of determing the standard samples and unknown samples and comparing to both results of experiment. This method shows some superiorities in convenience, accuracy, promptness, stability and re appearance.