Quality monitoring, controlling, and evaluating of radisonde data have important influence on the study of upperair observations, which is an important problem need to be solved urgently for meteorological researchers. The method to study the data quality is introduced, and assessment is conducted on the monitoring and controlling of the original data from the aspects of integrity, timeliness, and accuracy. According to the preliminary estimated data of the National Meteorological Center, the monthly average deviation and standard deviation of all radisonde stations are calculated, and the left and right ultrapoor boundaries are obtained by combining with the average standard deviation of each station. The errors of nonmeteorological significance are calculated and analyzed to form the external and quantitative quality information and scientific report. The method was implemented and applied in practice, and achieved good results, which could effectively, comprehensively evaluate the quality of radiosonde data. Problems in the data processing method and equipment could be indirectly found by analyzing and studying the radiosonde data, which was advantageous to improve the equipment and algorithm.