Based on the KOUN radar measurements, a classification model to identify the hail area and its application in operation are discussed. The results indicate that the model classifying result used dual-linear polarimetric radar observations is reasonable, it could retrieve not only the main shapes of realistic hails distribution but also the different types of hails, and the results have a good consistency with the true process of the convective systems. It is useful in operational works for the identification of hail areas and weather modification.