Abstract: To investigate the evolution of hail clouds over complex terrain and their microphysical responses to hail suppression operations, an objective tracking algorithm integrating multi-threshold morphological operations with 3D connected-component clustering is developed using C-band dual-polarization radar observations from Qujing, Yunnan Province. The algorithm is applied to two typical hail events to extract the three-dimensional physical characteristics of hail cloud evolution. Based on the extracted features, the threshold criteria for hail cloud identification using radar parameters are established, and the responses of each parameter to hail suppression seeding are systematically analyzed. From 70 hail cloud samples identified in the two Qujing events, the key radar parameter thresholds for hail cloud identification are determined as follows: maximum reflectivity factor exceeding 60 dBZ, height of the 40 dBZ strong-echo top greater than 13 km, domain-averaged vertically integrated liquid water content (VIL) above 13 kg·m?2, cloud lifetime longer than 30 min, and area of the 45 dBZ echo coverage exceeding 40 km2. For dual-polarization parameters, the differential reflectivity (ZDR) column should extend above 8 km, and the grid-point percentages of cross-correlation coefficient (ρHV) below 0.9 and specific differential phase (KDP) within the range of ?0.1 to 0.1 °·km?1 should reach 15% and 30%, respectively. The two hail suppression operations exhibited different efficacies. In the first event, catalytic seeding was conducted during the mature stage of the hail cloud. Subsequently, the strong-echo area, intensity, echo-top height, and domain-averaged VIL decreased monotonically; the strong-echo region descended below the 0 °C level; mid- and upper-level ρHV increased; and the regions of elevated ZDR and KDP contracted, weakened, and descended, resulting in hail cloud suppression and subsequent dissipation. In the second event, catalytic seeding was performed during the initial development stage. Although the physical parameters briefly declined, they subsequently rebounded sharply, accompanied by the re-extension of the strong-echo column and ZDR column to higher altitudes, the maintenance of KDP maximum at elevated levels, and a reduction in ρHV values, indicating hail cloud regeneration after initial suppression.