Abstract: The rainfall data at regional automatic weather stations can provide effective data support for meteorological warning, decision-making services and effect inspection. Establishing scientific and effective methods for quality assessment and control of rainfall data is essential for improving the applicability of rainfall data. Based on the historical data of 5-year rainfall observations at the regional automatic weather stations in Jilin Province, this paper presents a method for quality control of rainfall data to be suitable for the province, then uses this method to analyze and evaluate the rainfall data, and finally reveal error and abnormal data. According to the proportion of errors and abnormal data and the proportion of corresponding sites, it can be initially judged that the data quality is relatively high and the usability is good.