Abstract:Based on the 8th WMO international radionsonde system intercomparison, the systematic evaluation for Chinese GTS1 2 radiosonde system was carried out. The initial evaluation results show that the systematic error and standard deviation for temperature, pressure and geopotential height are 0.2℃ (below 33 km) and 1℃, 0.7 hPa and 1 hPa, and 40 gpm (below 33 km) and 320 gpm, respectively, which have better consistent performance, but the radiation correction algorithm needs further improving. On the other side, the relative humidity measurement gap still exists between China and foreign developed countries, especially focuses should be on the obvious large time constant and small reactive amplitude below -30℃--50℃. Finally, it should be mentioned that wind measurements for secondary wind finding method are very close to GPS wind finding measurements.