In order to study the influence of temperature and pressure on the migration and diffusion of radionuclide Rn in uranium tailings,the dynamic model of Rn migration under temperature-pressure coupling was established,and the distribution of Rn concentration and gas pressure in tailings stockpile under different conditions were analyzed by using the visualization processing technology of COMSOL numerical simulation software.The results show that within certain time,Rn slowly diffuses to the upper part of the tailings stockpile,so that the Rn concentration gradually increases in a certain range near the upper boundary and finally tends to be stable,and the Rn concentration and displacement increase linearly.In ideal state,under the influence of pressure and temperature,Rn on the surface of uranium tailings stockpileseparates out more quickly,so that the maximum Rn concentration in the upper part of tailings stockpile is relatively low,the time for Rn concentration in tailings stockpile to reach steady state is relatively short.Temperature accelerates the change of gas pressure,thus accelerating convection speed and finally promoting the migration of Rn.Study on the migration and diffusion rule of Rn in tailings stockpile under the coupling effect of temperature and pressure provides effective theoretical basis for the treatment of uranium tailings stockpile radioactive pollution.