Abstract: One dimensional differential equation for radon migration in the blasted uranium ore heap was established using radon seepage-diffusion migration theory, the formula for calculating the surface radon exhalation rate at the seepage exit in the blasted uranium ore heap was derived, and the methods for determining the relevant physical parameters were proposed. For a specific shrinkage stope, the influences of the air volume for ventilation, ore heap height and ore heap permeability on the radon exhalation rate were studied. The radon exhalation rate of the ore heap increases with the air volume for ventilation and gradually approaches its maximal value, but the growth rate decreases gradually with the increase of the air volume for ventilation. When the air volume for ventilation is small but is kept the same, the higher the ore heap is, the smaller the radon exhalation rate is. With the increase of the air volume for ventilation, the radon exhalation rate of the higher ore heap exceeds successively that of the lower ore heap, and the difference becomes larger and larger, and the higher the ore heap is, the larger the air volume for ventilation is for the radon exhalation rate to amount to its maximal value. The smaller the permeability of the ore heap is, the lower the radon exhalation rate of the heap is, the smaller the growth rate of the radon exhalation rate relative to the air volume is, and the larger the air volume for ventilation is for the radon exhalation rate to come to its maximal value.