Radionuclide activity concentration in drinking water cannot be measured directly at normal conditions. The water samples need to be concentrated under mild boiling conditions according to relevant standards. However, the method takes too long a time that it can hardly handle emergency measurements. A fast concentration method based on vacuum and low temperature is proposed in this study. The method was validated in the gross alpha and gross beta measurement of drinking water samples. The sample preparation time based on liquid scintillation counting (LSC) is only about 80 minutes, and the recovery percent of alpha certified sample is more than 80%, and that of beta certified sample is more than 90%. The experimental results show that the method can be used not only for the preparation of samples of gross alpha and gross beta measurement, but also for the preconcentration of specific nuclides measurement.