Using Qingdao dual-polarization Doppler radar data, conventional observations and data of regional meteorological observing stations, the differences in polarimetric signatures are analyzed between a severe hail supercell storm, which occurred in Zhucheng, Shandong on 16 August 2019, and a heavy precipitation supercell storm, which occurred in Gaomi, Shandong on 3 August 2020. The results are shown below. (1) The common features include Z_DR arc on the updraft side in the low level of storm, as well as Z_DR ring, deep Z_DR column and K_DP olumn around the strong updraft regions. (2) The major differences are as follows. The Zhucheng severe hail supercell storm has stronger maximum reflectivity, higher height of maximum reflectivity, stronger mesocyclone rotation intensity and storm top divergence intensity, but lower Z_DR column and K_DP column, and narrower Z_DR column and K_DP column. The strong mesocyclone rotation intensity and storm top divergence intensity are conducive to the overhang of storm core and the growth of hails. The wider and deeper updraft in Gaomi supercell storm brings the liquid or small wet ice particles with higher concentration to a higher height, resulting in higher Z_DR column and K_DP column. (3) The vertical distribution of humidity and the vertical profile of wind play a key role in the storm intensity and weather situation. The Zhucheng supercell storm occurs under the conditions of drier vertical humidity and northwest airflow, and results in severe hails; the Gaomi supercell storm occurs under the conditions of wetter vertical humidity and southwest airflow, and generates high-intensity precipitation.