The newgeneration weather radar system uses the 〖WTBX〗ZI〖WTBZ〗 relation to invert the precipitation. Different deviations emerge in different regions. During the observation of precipitation, the accuracy of quantitative estimation of precipitation may be weakened due to the influence of horizontal gusts, shortterm strong winds, echo intensity, topography, atmospheric refraction, and other factors. In this study, the precipitation is estimated by using the reflectance factor at different elevation angles of the radar basic data and the deviations between the estimated precipitation by radar inversion at different elevation angles and the rainfall data of automatic meteorological stations are compared and analyzed. According to the analysis of the deviation sources of estimated precipitation of radar and the precipitation deviation estimates, using mathematical statistics methods， it is concluded: the 2.4° estimates of precipitation own the highest linear correlation coefficient with automatic station observation and the radar estimation of precipitation in this angle is more real, and the 0.5° and 1.5° estimations affected by the topography are not applicable.