Abstract: The test identifies the method of determination of mercury for water quality by Inductively Coupled Plasma Mass Spectrometry.Aqua regia and gold are used as the dissolvent,and the sample is dissolved after being heated by the electrothermal plate to 180 ℃.The RSD of the determination results of the method is 1.39 %-4.98 %.The method has the advantages of simple operation,low cost,and high accuracy and precision.