A radar quantitative precipitation estimation group system is described in this paper which is established based on rain gauge adjustment techniques and is aimed to apply to meteorological operations. It provides hourly precipitation field in 10 minute interval and 1 km×1 km spacial resolution. Evaluation results by use of the data in the past three years show that the more the adjustment rain gauges, the higher the estimated precipitation accuracy. The relative error of hourly estimation during the year 2003 is about 40%, and even lower than 20% for the total precipitation in a precipitation event. The longer and larger the rain event lasts and covers, the higher the accuracy as well if the density of rain gauge station keeps fixed.