The difference in compositions and degradation rates of the epoxy adhesive in the polyimide / Copper interfaces are studied with Attenuated Total Reflection Infrared Spectroscopy。From the changes in intensities of the acid and ester characteristic bands,it is shown that not only the relative concentrations of the constituents but also the curing rates of the epoxy adhesive are different among four interfaces(Epoxy/CuO,Epoxy/Cu2O,Epoxy/Epoxy)。In addition,the degradation rates of the epoxy adhesive in the interface follow in the order of CuO>Cu2O>Epoxy≒PI。However,the benzotriazole coated on the surface of the CuO can decrease the degradation rate of the epoxy adhesive in the Epoxy/CuO。