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Based on the GPS/MET water vapor data, a comparative analysis of the GPS/MET vapor and four kinds radiosonde results calculated by using the regression method is conducted, and it is found that the radiosonde measurements of water vapor are generally 0.71 to 1.47 mm higher than those of GPS/MET, with the variance between 3.48 and 3.96, and the correlation coefficients are between 0.57 and 074. The variation amplitudes of RS92 radiosonde measurements of moisture are basically close to those of GPS/MET moisture，but the variation amplitudes of domestic sonde moisture measurements are obviously higher than those of GPS/MET by a factor of nearly 2.6 to 2.8. The microwave radiometer measurements of moisture are 16.12 mm higher than those of GPS/MET averagely. The analysis indicates that the measurements of microwave radiometers are obviously influenced by the revised models with different area corrections. Through the localization of the revised model, the abnormal high measurements of microwave radiometers are corrected, only 3 to 5 mm higher.