The effect of SBS irradiated with ,60,Co γ-rays at ambient temperature was studied in this article. SBS before and after irradiation were characterized by means of Fourier-transform infrared spectroscopy(FT-IR), differential scanning calorimetry (DSC), thermal gravimetric analysis(TG), scanning electron microscopy(SEM), and dynamic shear rheology(DSR). Almost no oxidation substance product was found in FT-IR spectra of the irradiated SBS. Cross-linking reaction occurred after SBS irradiation, and with increasing doses, the mass ratio of indiscerptible content in toluene developed. The analysises of DSC and TA indicated that ,T,g, of the flexible segment PB and rigid part PS shifted to a high temperature to some extent. A higher ,T,g, of about 120℃ came into being and the substance of resisting high temperature increased. According to DSR analysis, a network relaxation was observed after irradiation. The higher the irradiation dose was, the more obvious the peak value of tan ,δ, was. In addition, the shearing viscosity and the storage modulus ,G,’ became larger and the loss modulus ,G,’’ became smaller than those before irradiation. Temperature sensitivity of the irradiated SBS also reduced. The SEM analysis showed that irradiation can improve the antioxygenic performance of SBS.