Flue Gas Desulfurization (FGD) technologies is a removal process of sulfur dioxide in the exhaust gases resulting from the fuel's combustion that contaminated by carbon sulfur. By a reaction between flue gas and calciumcarbornate. As the absorbant and to produce a Flue Gas Desulfurization Gypsum (FGD-gypsum). This presentation is an analytical study of the quantity of heavy metals such as copper, iron, manganese, chromium, aluminium and cadmium are present in these FGD-gypsum. Experimental approaches, the sample solid in gypsum digested by microwave extraction to be Analyzed by Inductively coupled plasma-optical emission spectrometry (ICP-OES)