Rainfall erosivity shows the potential soil erosion induced by rainfall and is very important in pre-dicting soil erosion quantitatively. With the daily rainfall data from 12 meteorological stations in Jialing River basin, rainfall erosivity in the basin was estimated and its spatiotemporal variability was analyzed by using the daily rainfall erosivity model. Results showed that the spatial characteristic of rainfall erosivity was con-sistent with the spatial distribution of rainfall, declining from southeast to northwest and varying from 800 to 9000MJ·mm/(hm²·h·a). The inter-annual variation was great and C_v was between 0.346 and 0.493. However, result from Mann-Kendall test showed there was no significant trend of variation except Pingwu station with a decreasing trend. Rainfall erosivity presented seasonal dynamics in the whole year. The sea-sonal distribution of rainfall erosivity was highly centralized and rainfall erosivity from June to September oc-cupied 80% of the whole year. Rainfall erosivity had the periods of 21 and 35 years and different rainy-drier periods in the last 50years. Through the study, there was no significant trend of variation in annual rainfall erosivity, but rainfall erosivity was relatively concentrated in the summer and autumn. Therefore, some measures should be taken to prevent soil erosion or other disasters in flood season.