Three cases of severe convection with different intensities, including supercell, common hail storm and non-hail storm, observed by Xiamen S-band dual-polarization radar are presented in this paper. The characteristic differences of dual-polarization radar in these cases, containing differential reflectivity (ZDR), specific differential phase (KDP) and co-polar correlation coefficient (CC) during storm developing from growing stage to mature stage were analyzed. The ZDR and KDP columns are common features existing in these different intensities of storms. The supercell and common hail storm also have CC hole characteri-stics, featuring the inflow area near ground. In addition, ZDR arc and KDP foot also appear at low level and CC low value region with big hails at high level in mature stage of supercell. The variation of ZDR column can be used to identify super-cooled water area and forecast the developing trend of severe convective clouds. The CC hole can be used to identify the inflow area of convective cell. Then KDP column, KDP foot or its vacancy can be used to identify the areas of heavy rain or big hails. Therefore, the feature identification of dual-polarization radar have great potentials in short-term early warning of severe convection and hail suppression.