Abstract:Using the sounding data as a reference, taking the COSMIC occultation pressure from 1 January to 31 December 2014 as a GPS test sample, China was divided into four climate zones.The GPS occultation pressure was evaluated from the perspectives of double weight average, double weight standard deviation and correlation coefficient, and the quality control was carried out according to the statistical results.Results show that compared with the traditional method, the double weight average and the double weight standard deviation are less susceptible to abnormal data, and the evaluation resultsare more accurate.The differences of double weight average values of atmospheric pressure among the four climate zones are small.The doubleweight standard deviation is smaller in the subtropical monsoon climate zone (less than 6 hPa) and larger in the temperate monsoon climate zone (up to 15 hPa).With the sounding data as a reference, the statistics of atmospheric pressure deviation show that there is a positive deviation from the lower troposphereto the upper troposphere in the subtropical monsoon climate zone(about 0.8 hPa), and there are mostly negative deviation below 6 km and a positive deviation above 6 km in the other three climate zones (about 0.5 hPa).According to the statistics of correlation coefficient, the correlation coefficient is determined to be 0.80.According to the different statistical results in each climate zone, the threshold interval is divided.Quality control results show that the error points are mostly distributed in the areas where there is a big difference between GPS occultation pressure and sounding pressure.The percentage of error data produced by the two-step quality control is mostly less than 5%.Comparing the correlation coefficients between GPS occultation pressure and sounding pressure before and after quality control, it shows that the correlation between them is significantly improved after quality control.