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The Vaisala RS92 radiosonde represents the higher level of radiosondes and can be used as the benchmark to estimate other radiosondes types. Its performance can be evaluated according to the practical sounding data besides the indexes provided. The comparison method is used to analyze the data acquired from two Vaisala RS92 radiosondes which was released by the same balloon, and the statistical data from the same time of different days are compared to ascertain the performance of the radiosondes for sounding temperature, pressure, and humidity. The results indicate that the RS92 radiosonde has good measuring consistency performance in sounding temperature, pressure, and humidity， which could be used as the standard radiosonde to determine the measuring performance of other radiosondes types.