Abstract: An ICP-MS method for the determination of Hg in marine products was described in this paper.The sample was pretreated with microwave-assisted digestion and the digestion conditions had been optimized.Bi was selected as the internal standard element in detection.Standard reference materials have been analyzed for the verification of the accuracy of the method.Good linearity was ranged in 0.10-50.00 μg·L-1 (correlation coefficient 0.999 7) with recovery 95%-104%.RSD was 1.4%-3.5%.