To broaden the application of amorphous poly-α-olefin copolymer in the heat shrinkable material industry, in this study, effects of absorbed dose on the softening point, gel content, DSC properties and rheological properties of dimer acid polyamide/amorphous α-olefin copolymer blends were studied. When the mass ratio of dimer acid polyamide was ≤25%, dimeric acid polyamide/amorphous α-olefin copolymer blends presented radiation degradation characteristics, the softening point, the corresponding temperature T_j of the intersection of the storage modulus G′ and loss modulus G″ with temperature change, and intrinsic viscosity |η*| decreased with absorbed dose increasing; during the oscillating temperature test, the phase angle increased obviously with absorbed dose increasing, which showed viscoelastic transition characteristics. When the mass ratio of dimer acid polyamide was ≥50%, the blends presented radiation crosslinking characteristics, the dependence of viscoelastic transition on temperature and the dependence of intrinsic viscosity on frequency were reduced with absorbed dose increasing.