Abstract: The effect of Co⁶⁰γ- ray radiation on spherulites, lamellae and crystallites etc.of melt-cry-stallized high density polyethylene was studied with small angle light scattering,small anglex-tay scattering (SAXS) and wide angle x-ray diffraction techniques. It has been shown that there is a tendency to preserve the contour and optical anisotropy of spherulites in irradiation samples afrer melting and recrystallization due to radiation-in-duced cross-linking. The higher the radiation dose. the stronger the tendency to preserve.Lamellae preserve their own profile, although crystalline damage takes place within lamellae due to irradiation. The damage of the crystalline lamellae cannot be explained vrith "lamellae surface damage" mechanism suggested by Keller. A "lamellae cored damage" mechanism has to be suggested and could give a more satisfactory explaination of the SAXS results.