Based on the hourly data of 31 rain gauges of Anhui province and Hefei radar echo data, the correlation between radar echo data and rainfall data is analyzed, the best elevation angle data of rainfall estimation in different area is studied, and six elevation angles are collected. The size of correlation characterizes the capability of rainfall estimation of Hefei radar. The result indicates that the correlation between 0.5°radar echo data and rainfall data is much higher in most stations. The capability of rainfall estimation of Hefei radar is higher in center of Anhui province and Huaihe River coastwise area than other areas; it is lower in provincial boundary.