Abstract: In order to find out the migration behaviour of radon transport in groundwater environment at uranium mine,transport process of radon in porous aquifer medium was simulated by laboratory experiment of radon transport and tracer experiment.This paper made in-depth discussions on the migration rules of radon in groundwater and soil and revealed the behaviours of radon in the environment.The experimental results indicated that convection dominated on the movement of radon in porous aquifer medium.The lateral migration of radon was due to not only diffusion but also carrying of groundwater,adsorption of porous medium,decay and volatilization.The lateral migration played an important part in the movement of radon.The cluster theory and microbubble theory in the existing research results were not the principal migration mechanism of radon transport in porous aquifer medium.Release and accumulation,volatilization,decay,adsorption and convection should be the result of radon movement.The findings provided the scientific evidence for quantitative study of migration behaviours of radon in the underground environment and further support for the theory that the application of radon in uranium mine exploration.