Abstract: Based on data collected from conventional weather stations,NCEP,and EC reanalysis,this study conducted an in-depth analysis of two significant precipitation events that occurred on the northern slope of the Central Kunlun Mountains on June 25 and 28,2019.The results showed that:The rainfall event on the 25th exhibited large-scale and prolonged attributes,while the event on the 28th was characterized as convective severe precipitation.The meteorological systems influencing these weather processes comprised the upper-level jet stream,middle-level low-pressure system,and lowlevel convergence line.On the 25th,the heavy precipitation system demonstrated slow movement,coinciding with the influx of cold air from the east and west into the northern slope of the Kunlun Mountains.The southwest wind originating from the western side of the West Pacific subtropical high transported a substantial volume of water vapor to the northern slope of the Kunlun Mountains.Furthermore,convergence of easterly,northerly,and westerly winds at the lower level was observed.In contrast,the low-pressure system associated with heavy precipitation on the 28th exhibited a rapid movement.Inversion and instability within the troposphere,coupled with afternoon warming,weak convergence at the lower level,and northerly winds in front of the mountain,served as trigger conditions for convective activity.The study findings emphasize the pivotal role of water vapor transport from west to south at middle and high levels,as well as the transport of water vapor by the wind field at lower levels,as key factors driving heavy rainfall.The intensity and thickness of water vapor transport were notably more pronounced on the 25th compared to the 28th.Notably,the analysis highlights the profound impact of topography on the precipitation process,influencing both thermal and dynamic aspects.