The nuclear system may be a fractal object with the characteristic of self-similarity, the nuclear irregular structureproperties and the self-similarity characteristic are considered to be an intrinsic aspects of nuclear structureproperties. For the description of nuclear geometric properties, nuclear fractal dimension is an irreplaceable variablesimilar to the nuclear radius.In our present description, a more general conception of nuclear fractal clusters (NFCs) is applied, which is similarbut different from the conventional one of the -cluster structure and the core plus valence nucleons structure inhalo nuclei.