Abstract: Using Qingdao dual-polarization CINRAD/SA data, conventional observation data and regional automatic station meteorological data, the polarimetric radar signatures of a supercell storm occurred in Zhucheng, Shandong Province on 16 August 2019 are analyzed. The results show that the supercell storm occurred under the background of interaction between the northeast cold vortex and a surface mesoscale convergence line. The CAPE was small, but the vertical wind shear between 0 and 6 km altitude was very strong. This configuration was conducive to the formation and maintenance of supercell storms. The average values of DBZM, C-VIL, HT and TOP of Zhucheng supercell storm, which lasted about 3 hours and accompanied by a deep and persistent mesocyclone, were 74.1 dBz, 67.9 kg/m², 6.3 km and 11.3 km respectively in its mature stage. The echo area with reflectivity above 60 dBz in lower levels of the storm had small Z_dr and CC but large K_dp, indicating that a certain number of wet (or dry) hails and liquid raindrops existed at the same time. In addition, obvious Z_dr arcs near the inflow gap in lower levels of the storm were found. The bounded weak echo region (BWER) was detected in the strong updraft area located in middle levels of the storm, and the top of BWER reached about 7 km. Z_dr and CC rings around the BWER were observed in middle levels, and the top of Z_dr ring reached the −10℃ layer height. The deep Z_dr and K_dp columns above the 0℃ layer were observed in the vicinity of the main rotating updraft with their tops reaching the height of −20℃ layer. The Z_dr column was located to the east of the BWER and the K_dp column was located to the west of the BWER. The Z_dr column between −10℃ and −20℃ layer corresponded to strong Z_h (35—60 dBz) and small K_dp, indicating that there were a few large liquid and/or wet ice particles. The K_dp column corresponded to strong Z_h (55—72 dBz) and small Z_dr, indicating that there were a number of small liquid and/or small wet ice particles and large ice particles. Significant negative Z_dr values in the radial direction behind the strong reflectivity core at lower levels of the storm can be used as signals for identification of extremely large hails (diameter ≥50 mm). The strong reflectivity core at lower levels of the storm corresponded to an abnormally large K_dp value, indicating that it contained hail particles covered by water film and high concentration of liquid raindrops.