Аннотация:A technique has been developed to construct radioecological maps of the territories polluted after Chernobyl accident. It assumes construction of a series of maps in one and the same scale to perform structure division of factors of radionuclides migration in the environment. Combination of these maps and a global radioecological data included into a geoinformation system allows one to perform a valid spatial extrapolation of radioecological models as well as to recommend correct land tenure, making decisions, and risk estimating. A series of maps of a Bryansk region with 1:200 000 scale was choosen to demonstrate the described technique.