Based on a study of the survey methods and the formation mechanism of the anomalies caused by radon and its daughters over the sandstone uranium deposits, this paper deals with the data processing and interpretation methods. An analysis of the measured data from Dongsheng area shows that the low value anomalies of radon and its daughters are in accord with the mineralization sectors, and that the anomalies caused by radon and its daughters as well as the interpretation method are effective. This study has laid the foundation for the application of radon and its daughters characterized by great penetration capacity in search for uranium deposits.