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In August 2012, an experiment was carried out on the new GPS radiosonde sounding system, an automatic sounding system，and the accuracy after its technology improvement is compared and analyzed. The results show that the temperature of new GPS radiosondes is significantly better than that of GTS1 2 radiosondes. The humidity results are consistent with those from RS92 radiosondes. The system error is 15%; the standard deviation is less than 12%. The system error of pressure is within ± 10 hPa; the standard deviation is less than 08 hPa. The system error of geopotential height is within ± 20 gpm; the standard deviation is less than 70 gpm. The results of wind measurement are better than those of GTS1 2A.