Abstract: Dental amalgam has been the most useful restorative material in dentistry for more than 150 year. Widely pure and applied scientific study has been done in filed of determining amalgam`s phases and composition, mechanical and corrosion properties of amalgam alloy. But there are very few reports in quantitative analysis of metals content of powder alloy. The works which have been done is mainly on used amalgam alloy or quantitative analysis of removal metals from the alloy. In this study, determination of silver, copper and tin, as basic components of powder alloy, by three; gravimetric, atomic absorption spectroscopy and Inductive Coupled Plasma atomic spectroscopy (ICP), methods and their precision are studied. The simultaneous solution of the three metals required for AA and ICP methods, is also studied. The statistics is done on basis of ASTM standard methods. As the conclusion, the ICP method for quantitative analysis of silver, copper and tin in powder amalgam alloy with composition 4:2.8:3, respectively, is recommended.