Abstract：[Objective] The difference of soil moisture distribution along hillslopes lead to significant spatial variability in soil water storage (SWS) due to variations in meteorological conditions, vegetation characteristics, soil properties and topographic features. However, the current understanding of soil moisture dynamics and their influencing factors at different slope positions on forested hillslopes remains insufficiently systematic. [Methods] A comprehensive field investigation was conducted on a representative larch plantation hillslope in the semi-humid Liupan Mountains. From May to October 2023, we monitored the spatiotemporal dynamics of soil volumetric water content in the 0-80 cm soil layer at upper, middle and lower slope positions. Concurrent measurements of meteorological conditions, vegetation structure and soil physical properties were carried out to support the analysis. [Results] (1) There were slope differences in soil water storage (SWS), with the mean values of middle slope > lower slope > upper slope. However, the fluctuation of SWS was greatest on the upper slope. (2) Temporally, the incremental changes in SWS in the 0-80 cm soil layer were highly variable at all three slope positions during a single rainfall event. Among different layers, the SWS in the 0-10 and 10-20 cm soil layers demonstrated relatively lower variability. The temporal variation of SWS increments was primarily influenced by 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. Among different layers, the SWS in the 10-20 cm soil layers displayed the least variability. The temporal variation of SWS reduction was mainly governed by potential evapotranspiration and the duration of rain-free days. (3) Spatially, SWS increment magnitude followed middle slope > lower slope > upper slope, mainly related to soil bulk density and saturated hydraulic conductivity. The of SWS reduction magnitude followed 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.