[Objective] This study assessed the temporal and spatial variation of rainfall erosivity at Pingjiang basin in the upstream of Ganjiang River to provide a basis for the formulation of watershed management measures in this area.[Methods] Daily precipitation data from 1989 to 2018 from ten stations in the Pingjiang basin were used. Rainfall erosivity was calculated using a simple algorithm, and temporal variation in rainfall erosivity was analyzed using the Mann-Kendall method and climate tendency rate. The spatial variation of rainfall erosivity was analyzed via the Kriging interpolation method using ArcGIS 10.1.[Results] Annual rainfall erosivity from 1989 to 2018 at Pingjiang basin was 4 233 MJ·mm/(hm²·h·a), while the maximum value[6 766.5 MJ·mm/(hm²·h·a)] occurred in 2015 and the minimum value[2 191 MJ·mm/(hm²·h·a)] occurred in 2003. Rainfall erosivity at Pingjiang basin from 1989 to 2018 was relatively stable, showing an insignificant increasing trend in interannual distribution over the study period. The annual distribution was consistent with precipitation levels, showing a bimodal pattern in June and August. The spatial variation of rainfall erosivity at the basin showed a decreasing trend from the northeast to the central south and an increasing trend to the southwest. The maximum value appeared near Chenggang station at the north of the basin, and the minimum value appears near Longkou station at the south central of the basin.[Conclusion] The spatiotemporal variations of rainfall erosivity in the Pingjiang basin are largely consistent with precipitation levels. For the prevention and control of soil and water loss, attention should be focused on the northern part of the basin in spring, and the southwestern basin during summer and winter.