Abstract: The revised version of Diagnosis Criteria for Radiogenic Neoplasms (2002) is Judgment Criteria for Cause of Radiogenic Neoplasms (2009). There were two main modifications in the new edition: judgment criteria and estimation method. In respect of the judgment criteria, one was that the kinds of neoplasms which can allowed to estimates the probability of causation (PC) enlarged from 5 to 10, the another was PC≥50% in the 0.95 profile quantiles was instead of PC≥50% in the 0.5 one as the judgment criteria. In respect of basic parameters, besides the excess relative risk, the excess absolute risk was added for estimation of PC. All of them were aimed to protect the rights and interest of the claimant according to the situation of China and correspond to the international development trend.