Abstract: Objective Sediment connectivity is a core indicator for analyzing regional sediment transport pathways and source contributions. Current research mainly focuses on the spatiotemporal distribution of single connectivity at a single type of connectivity index, while the spatiotemporal characteristics and applicable scenarios of multiple connectivity indices for sediment transport conditions at different time scales in a watershed remain to be further explored. Method Taking the Xiangxi River Basin in the Three Gorges Reservoir Area as the research object, based on structural, functional, and composite connectivity indices, this study explores the spatiotemporal variation characteristics of multiple sediment connectivity at different scales and compares the applicable scenarios of different indices. Result 1) The interannual variation range of the three types of indices is 1.34% to 52.03%, while the monthly variation amplitude is significantly higher than the interannual variation, with the monthly variation range of the composite connectivity (ICR) reaching up to 407.87%. Functional connectivity (IC_R) is dominated by rainfall, showing high values in summer and autumn and low values in winter and spring. Structural connectivity (IC) is driven by the interception effect of vegetation, and its trend is opposite to that of vegetation coverage. 2) The response of IC_R to rainfall events has a nonlinear characteristic, showing a decreasing marginal effect trend (R2 = 0.93). 3) At the interannual scale, the three high-value connectivity areas are concentrated in the channels, catchment areas and human activity areas. At the monthly scale, IC and ICR are abnormal in winter and spring (from November to March of the following year), with higher values in areas farther from water systems. 4) At the interannual scale, all three types of connectivity indices are positively correlated with sediment yield. At the monthly scale, IC_R and ICR are significantly positively correlated, and IC and IC_R have important characterization effects in some months. Conclusion Multiple sediment connectivity indices all have time scale effects, and composite connectivity is the optimal index for characterizing sediment transport in multi-scale watersheds under a subtropical monsoon climate. Soil and water conservation should focus on key interception zones on both banks of the middle and lower reaches of the watershed and seasonal connectivity peaks driven by rainfall and vegetation.