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The continuous measurement of the radon exhalation rate of soil is quite important to radon exposure research as well as the evaluation of the cover design for uranium mill tailings.A continuous measurement system was developed and was applied to the measurement of the radon exhalation rate of soil in Beijing.The measurement results show that the average value of soil radon exhalation rate is 42.5 mBq m-2s-1 with a variation of 13.1~110 mBq m-2 s-1,which quite similar with other researchers result.The precipitation has a most important influence on the radon exhalation rate,normally the radon exhalation rate increases after a small rainfall,but it decreases to nearly zero shortly after a huge rainfall(with a precipitation rate of 238.5mm h-1).In May,the soil radon exhalation rate shows a clear daily variation,which higher at noon and lower at midnight.