Abstract: The heap-leaching uranium ore heap is one of the main sources of atmospheric radon of uranium mine. In order to reveal the radon exhalation rule on the surface of the heap-leaching uranium ore heap, taking the new ores from certain uranium mine in southern China as the experimental samples, the improved one-dimensional heap-leaching experimental device which was designed and made autonomously was used to measure the radon exhalation rate on the surface of the ore heap under different spray conditions and during the drainage with the local static method. The results show that in the moment of beginning spray and changing spray intensity, the radon exhalation rate of the ore heap surface increases suddenly, then gradually decreases and finally reaches stable along with the spray continuing. It is also found that the radon exhalation rate of the ore heap surface during the stable period of the seepage in the ore heap decreases with the increase of spray intensity. In the process of drainage, the radon exhalation rate decreases rapidly, then gradually increase and stabilizes finally.