Abstract: The Baihetan Hydropower Station (BHS) is located in the dry-hot river valley downstream of the Jinsha River, where frequent windy weather and rainstorm during the wet season are common. In order to explore the characteristics of the evolution of atmospheric circulation and low-level jet during wet season rainstorm and gale events in this particular terrain, ground observation data and ERA5 reanalysis data are used to analyze the formation mechanism of 13 wet season rainstorm and gale events in the dam area of BHS from 2018 to 2021. The results show that based on the characteristics of the 500 hPa circulation pattern, the 13 rainstorm and gale events can be classified into 4 types: eastward-moving low trough type, subtropical high type, joint influence of low trough and subtropical high type, and tropical depression type. In all 4 types of rainstorm and gale events, there is always a significant development of low-level jets at 700 hPa, characterized by the weakening and eastward movement of the southwest jet stream due to the influence by the summer monsoon. The westward jet stream and the southeastward jet stream on the northwest side of the subtropical high as well as the southward jet stream on the northern side of the tropical depression in the Bay of Bengal are responsible for water vapor transport during rainstorm events. Based on the key influencing systems and low-level jet evolution, conceptual models of the 4 types of rainstorm and gale events in the dam area of BHS are established. The occurrence of the 4 types of rainstorm and gale events is mainly influenced by the eastward movement of the westerly trough, as well as favorable conditions of abundant water vapor transport on the edge of the subtropical high and the northern side of the tropical depression. Low-level jets play an important role in triggering and maintaining rainstorm and gale.