Abstract: Based on the brief introduction to the characteristics of the site of a very low level waste landfill, the main parameters selected as well as the model for the prediction of radionuclide migration, this paper focused on the migration of ³H, ⁹⁰Sr in both aquifer flow water and flow aeration in the landfill. Through the simulated migration prediction and analysis, the migration pattern of ³H, ⁹⁰Sr in a specific site was revealed, which provided the basis for the safety assessment of a site.