[en] For comparing characteristics and accuracy of different methods, the simultaneous measurements of radon and thoron progeny were done using five-count filter method, two-count filter method and spectroscopy method in the Radon Key Lab of Hunan Province. Five-c ount filter method is more accurate than two-count filter method, however it is difficult to adopt five-count filter method for survey of environmental radon and thoron progeny in batches because of its longer measuring period (above 10 h) and more counts. The errors of two-count filter method are large in condition of concentration of thoron progeny higher than that of radon progeny. LCD-BWLM alpha spectroscopy method has some advantages such as simple operation, discrimination of a particles emitted from different nuclear, continuous measurement and so on, but the measurement results of thoron progeny are not reliable before measuring eight hours and under condition of variational thoron progeny. Filter must be hewed when the instrument is restarted. (authors)