Abstract: Based on the conventional observation data and the radar data, the regional model of Southwest China (SWCWARR) and Chongqing Rapid Updata Cycle (RUC) model were used to comprehensively analyze a severe convective weather process that occurred at Chongqing Jiangbei International Airport from 27th to 28th April 2019. The results show that this convective process was impacted by the surface convergence front, forward trough and the vertical shear caused by the intersection of the southwest warm air and the cold air behind the upper trough. SWCWARR model showed obvious superiority. It is worth mentioning that the newly formed convective cells in the south of the airport were accurately predicted by SWCWARR model after 18UTC on 27th, which provided a useful reference for the operation of the southern route. Moreover, the diagnostic analysis of some physical quantities based on SWCWARR model showed that the low-level southwest wind had a high positive correlation with the occurrence and development of severe weather system. In particular, the narrow tube effect caused by the topography in Chongqing forced the southwest wind to lift and strengthen, which promoted the occurrence and development of severe convective weather in this area.