Aging behaviors of polycarbonate under gamma irradiation were investigated by mechanical testing, scanning electron microspectroscopy, differential scanning calorimetry, Fourier transform infrared spectroscopy, gel permeation chromatography and X-ray photoelectron spectroscopy. The results show that tensile strength, glass transition temperatures, molecular weights and number averaged polymerization degree of the polycarbonate decreased with the dose. The smooth degree of fracture surface increased with the dose. Radiation degradation kinetics revealed that the degradation of polycarbonate under gamma irradiation is random degradation.