Abstract: Using conventional meteorological observation data, automatic station hour and minute encrypted data, four wind profile radar data, CMA best path dataset, and NCAR（National Center for Atmospheric Research）reanalysis data, analyze the heavy precipitation process caused by Typhoon Dujuan in Shandong Province from July 28 to 30, 2023, the results indicate that: (1)The process of heavy precipitation caused by Typhoon Dujuan in Shandong can be roughly divided into three stages, with the affected systems being typhoon trough, typhoon residual pressure circulation, and southeast wind jet stream. (2) Typhoon trough stage:Has convective precipitation characteristics, The process of strengthening and thickening of the mid-level northeast wind, and the transition of low-level northeast wind to southeast wind corresponds to the occurrence of heavy precipitation; The increase in the low-level jet stream index has a lag in indicating precipitation; The sudden increase in vertical wind shear corresponds to the beginning of precipitation, while the decrease corresponds to the end of precipitation. (3)The residual pressure circulation stage of typhoons: mainly characterized by stable precipitation, with the strengthening of southeast winds in the middle and upper layers and the strengthening of northeast winds in the lower layers, corresponding to the occurrence of heavy precipitation. The entire southeast wind structure corresponds to weak precipitation; The advance time of the increase in low-level jet index compared to the increase in rainfall intensity is about 1 hour, and the oscillation of the index corresponds to the occurrence of sustained weak precipitation; Before the occurrence of heavy precipitation, the vertical wind shear in the middle layer first increases, and the onset of strong precipitation begins 3-4 hours earlier. The center of strong shear in the middle layer extends towards the upper and lower layers, corresponding to the occurrence of heavy precipitation. (4) Southeast Wind Jet Stage: Significant enhancement of low-level southeast winds corresponds to the occurrence of heavy precipitation; The advance time for the increase of low-level jet index compared to the increase of rainfall intensity is about 2 hours; During this stage, the vertical wind shear in the middle layer remained at around 10 m·s-1. Before the occurrence of heavy precipitation, the vertical wind shear in the middle layer first increased, and the time for strong precipitation began 5-6 hours earlier.(5) The vertical velocity of wind profile radar corresponds well with the time of precipitation occurrence, and there is a certain positive correlation between velocity magnitude and precipitation intensity.