The dynamic mechanical properties and thermal behavior of gamma radiation crosslinked LDPE/EPDM blends have been investigated over a temperature range from -50 to 100℃ and-70 to 150℃respectively. The results show that there is a damped peak （tanδmax） of about -20℃ in the dynamic mechanical spectra

and the peak temperature is denoted as Tβg

but the damped peak in low temperature region for each of LDPE and EPDM in blends disappeared. After irradiation

the Tβg of the LDPE/EPDM blends still appeared on the spectra

and gamma radiation does not affected the compatibility of LDPE and EPDM. The thermal analysis results reveal that the fusion temperature Tm of irradiated LDPE/EPDM systems decreases with the increase of radiation doses.