Electrically conducting PET film was prepared by introducing amide group or cyano group into the PET film and then subjecting Cu_xS, which is known as the p-type semiconductor, into the grafted PET film. The effect of emulsifier on grafting of acrylamide on PET film was investigated and optimum conditions for the introducing of Cu_xS (ICuSO₄) 30 g/l, reaction time 3hrs) was studied. The Cu_xS-induced electrical conductivity of PET film was higher by order of 10^-13 than that of the original PET film. Using recently developed FT-IR, trans-gauche configuration was investigated. From energy dispersion X-ray analysis, Cu/S of Cu_xS-induced PET film was calculated. The morphology of Cu_xS-induced PET film surface was investigated with SEM.