On July 24, 2024, a heavy rainfall weather process occurred in the southwestern Sichuan Basin, the wind field characteristics of the process were analyzed by using ground observation data, ERA5 reanalysis data and wind profile radar measurements. The results showed that: (1) The northeast airflow below 850 hPa induced a topographic uplift over the southwestern Basin and produced the heavy rainfall. (2) The surface convergence line was formed by the joint influence of topography and the corresponding level of high-altitude winds, and the northwest-southeast long convergence line was formed when the northwest wind was dominant, and the northwest-southeast long convergence line was formed when the northeast wind dominated. (3) The network-retrieved radar wind fields revealed that the convective system exhibited an east-to-west tilted structure from low to high levels, with small-scale multi-vortex features observed at the 2.5° elevation layer. (4) The wind profile radar showed the evolution of the upper-air wind well, and its vertical velocity was inversely proportional to the strength of the rain.