Abstract: As the leading institute of the draft group, the Institute of Radiation Medicine, Chinese Academy of Medical Sciences drafted "Judgment standard for occupational radiogenic neoplasms" GBZ 97-2017 and developed its software. This paper introduces the calculation logic of the software, as follow: the methodology of probability of causation in GBZ 97-2017, including the theoretical basis of rationality for using causation probability for the judgment of radiogenic neoplasms; Japanese risk model in estimating cancer risks induced by ionizing radiation and risk transfer model from Japanese population to Chinese population; and use of smoking correction factors to eliminate smoking attribution to lung cancer. This paper introduces the general situation of GBZ 97-2017 software development and its deficiencies and suggests the development of an online software.