Abstract: Based on regional density data and conventional observation data on a total of 70 rainstorm weather processes in Luzhou from 2014 to 2021, this paper researches on the conceptual model classification and forecast index. The results show the forecasting conceptual models can be divided into westerly trough moving type, the low vortex shear type, the east wind wave disturbance type, and the south wind type. And the first two types play a leading role, while the last two types are not often. In addition, the extreme rainstorms in the northern districts and counties of Luzhou are related to the low trough, low vortex, and stable shear line of the west system, and the 500 hPa and 700 hPa wind speeds that form these systems have reached 12 m/s. While The extreme rainstorms in the southern districts and counties are related to the disturbance of the east wind wave and the movement of the easterly air around the typhoon.