Abstract:The quality control of automatic rain gauge data is the most fundamental and the most crucial issue in the joint estimation of precipitation using radar and automatic station data. Taking the 891 automatic rainfall stations in Guangdong Province as analysis objects’ and using the conventional automatic rainfall station data for the quality control of themselves, as well as the introduction of radar data, we find the relationship between the ground truth rainfall and radar rainfall estimates by analogy deviation method, and further control over the information on the rainfall stations can formulate a set of automatic station quality control method combined with radar data. The radar echo intensity and the relevance of automatic stations were also studied. Through statistical analysis of large amounts of data we have obtained the following conclusions: being investigated in the 891 automatic rainfall stations, about 2.9% (26) of the automatic rainfall station sites could be identified as wrong, about 3.4% (30) automatic rainfall stations were classified as sites with serious problems, about 25.8% (230) automatic rainfall stations were listed as a general problem with the site. The comprehensive analysis of many cases has proven the feasibility of this method and some limitations of this method are also pointed out.