Based on the S-band dual-polarization Doppler weather radar data of Jinan, combined with sounding and surface meteorological observation data, the characteristics of dual-polarization parameters of two heavy precipitation storms that occurred in the same area in 2019 are analyzed. The results are shown below. 1) The two convective precipitation processes occur in a favorable environment with weak vertical wind shear, strong convective available potential energy, high humidity in the lower layer, and high 0 ℃ layer, which are conducive to the occurrence of short-time precipitation. 2) The two heavy precipitation storms are characterized by low-centroid tropical rainfall, and the zone of high reflectivity above 45 dBZ is mainly located below the 0 ℃ layer of the environment. 3) The zone of high reflectivity in the lower layer of the storm corresponds to large ZDR and KDP values with ZDR equal to or higher than 0.5 dB, KDP equal to or higher than 0.5°·km-1, and CC equal to or higher than 0.95. The main dual-polarization parameters of high-intensity precipitation are featured by reflectivity between 50 dBZ and 54 dBZ, KDP higher than 1.0°·km-1, CC equal to or higher than 0.97, and moderate ZDR between 0.5 dB and 2 dB. 4) There is a significant difference in the height of ZDR columns and KDP columns during the two heavy precipitation storms. The ZDR column and KDP column appear in front of the heavy precipitation storm with the height approaching the -10 ℃ layer on 27 July, while the ZDR column and KDP column are slightly higher than the 0 ℃ layer on 10 August. The height of ZDR column has an indicative effect on the intensity of thunderstorm.