In the quantitative precipitation estimation of China New Generation Weather Radar (CINRAD) adjusted with rainfall stations, better matching between radar echo intensity and the observation from rainfall stations is the key to fit Z-R relationship accurately. The large spatial and temporal changes characteristics of convective precipitation echo intensity have a serious impact on the radar and rainfall station data matching and the accuracy of quantitative precipitation estimation. According to analysis the spatial distribution of error between the convective precipitation estimation of radar and rainfall station of three convective precipitation process in Henan Province, the following rules are founded: most seriously overvalued radar echo intensity points and some underestimate points are distributed on the edge of the strong echo intensity area with the single point's echo-intensity changes with time; part of rainfall stations with zero value observation for part time are distributed in the center of the strong echo intensity. The analysis shows the sudden heavy precipitation and heavy precipitation center is easy to cause the large error of observation from rainfall stations and therefore cause great influence on the Z-R relationship fitting. According to the characteristic of convective echo-intensity and the matching relationship between the echo intensity and rainfall stations got in this paper, adding method of eliminating large error rainfall stations by using the echo intensity gradient index and also method to optimize the average echo intensity and cumulative time are proposed, and get the best solution for convective precipitation estimation. Through analyze influences of all above factors on the precipitation estimation in detail, the results show that eliminate the large error rainfall stations by a certain index and then use the best precipitation estimation solution, and these improve estimation precision for convective precipitation.
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