[Objective] Variations in meteorological conditions，vegetation characteristics，soil properties，and topographic features lead to differences in soil moisture distribution along hillslopes，which in turn cause significant spatial variability in soil water storage（SWS）. However，the current understanding of soil moisture dynamics and their influencing factors at different slope positions on forested hillslopes remains insufficiently systematic. [Methods] A study was conducted on a typical larch forest hillslope in the semi-humid Liupan Mountains. From May to October 2023，the spatiotemporal variations in soil volumetric water content were monitored at three slope positions（upper，middle，and lower）within the 0―80 cm soil layer. During the same period，meteorological conditions，vegetation structure，and soil physical properties were observed simultaneously. [Results] 1）Soil water storage（SWS）varied significantly across different slope positions，with the average values following the order：middle slope>lower slope>upper slope. However，the greatest fluctuations in SWS were recorded on the middle slope. 2）Temporally，the incremental changes in SWS within the 0―80 cm soil layer exhibited strong variability across all three slope positions during a single rainfall event. Among different layers，the SWS in the 0―10 cm and 10―20 cm soil layers demonstrated relatively lower variability. The primary factors influencing the temporal variation of SWS increments were rainfall amount and duration. The variation in SWS reduction in the 0―80 cm soil layer was also highly variable at all three slope positions during a single rain-free period，with the least variability observed in the 10―20 cm soil layers. The main factors affecting the temporal variation of SWS reduction were potential evapotranspiration and the duration of rain-free periods. 3）Spatially，SWS increment magnitude followed the order of middle slope>lower slope>upper slope，mainly related to soil bulk density and saturated hydraulic conductivity. The magnitude of SWS reduction followed the order of middle slope>upper slope>lower slope，mainly related to stand evapotranspiration，gravel volumetric content，and total porosity. [Conclusion] These findings provide valuable insights into the mechanisms of soil water redistribution on forested hillslopes and offer scientific guidance for sustainable forest-water management in semi-humid mountainous regions.