TCDD is the main by-product of industrial wastes and chemical processes and also persistent organic pollutant of dioxin congeners which have low biodegradable and more biomagnification capacity in animal tissue. The dioxins and dioxin like compound mainly enters through food chain and causes hazardous effect to human beings. The aim of the present study was to determine the qualitative analysis of TCDD and precursor compounds in different food sources through GCMS. The result showed GCMS of soil (collected from industrial area), butter, meat and egg yolk indicates different isomers which are direct precursor of TCDD and some of them are intermediate compounds in chemical manufacturing processes.