Abstract: With the conventional observation data and Neijiang X-band dual-polarization radar data, the changes in the circulation situation of two different types of strong convective weather in July and August 2021 are analyzed. The results show that: The weather process in July was a regional rainstorm influenced by a low-value system outside the subtropical high and the situation at all levels was well coordinated. The weather process in August was a process of thunderstorms and gales inside the subtropical high, and the middle and lower layers were dominated by easterly air flow and inverted trough shear, so local precipitation was obvious. The local dual-polarization X-band radar reflected the above two severe convective weather basically. In the convective precipitation, Z_DR fluctuated between −3.5~3.0 dB, K_DP was greater than 3°/km, and ρ_hv was below 0.98. In the stable precipitation, Z_DR was uniformly positive, and the maximum exceeded 3.5 dB, while K_DP fluctuated in the range of −0.5~1°/km, and ρ_hv was above 0.98. In the gale process, Z_DR fluctuated between −3.5~3.5 dB, K_DP was positive and exceeds 2°/km, and ρ_hv was above 0.98.