With the great development of nuclear power, radwaste safety disposal has become an advanced research hotspot worldwidely. Safety performance of a deep geology disposal vault is mainly dependent on the degree of radionuclide migration from the vault to biosphere. As pluton rocks, the radionuclides in disposal were transported from deep geological media to biosphere mainly by groundwater through rock fracture or contact plane. In order to interpret and predict th e radionuclide migration behaviour in granitic contact zone, the removal ratios and input ratios of 226Ra, 234U and 230Th in granite bodies and in their fracture are calculated according to a model based on a-recoil theory and the measure radionuclide activity ratios of the samples from the Xiangcaoping and Douzhashan granitic bodes. The results are in conformity with the previous conclusions derived from geochemistry study. The results show that the removal ratios of radionuclides caused by a-recoil damage are greater than that by their natural decay, and the fracture coating fillings could retard a considerable amount of radionuclides which came from the granite bodies of contacted zone. Granitic bodies have the great power to retard the migration of radwastes so that they could be served as an effective natural barrier to block the radwaste transport from the deep geological vault to biosphere.