[Objective] In order to provide references for the future remote sensing monitoring of soil and water conservation of the linear production and construction project in Ningbo City of Zhejiang Province, it is crucial to investigate the spatio-temporal distribution of soil erosion in ring expressway before and after construction and construction process.[Methods] Land use/cover map of Ningbo City in 2010, topographic map, map of North Ring expressway and field survey data was collected to derive digital elevation model (DEM). Rainfall data was collected from local hydrological station. Based on the collected data, the spatial distribution of the factors in RUSLE model was calculated, and soil erosion maps of the north ring expressway were estimated. Then, the soil erosion amount was calculated at three different stages by using RUSLE model.[Results] Slight erosion was dominant during preconstruction period and natural recovery period, which accounted for 98.53% and 99.73%, respectively. During construction period, mild erosion and slight erosion was the largest, which accounted for 52.5% and 35.4%, respectively. The average soil erosion modulus of construction period was 1 380.9 t/(km²·a), which was 251.3 and 155.4 t/(km²·a) higher than that of preconstruction period and nature recovery period, respectively.[Conclusion] Soil erosion during the construction period is mainly distributed in the temporary soil ground. Furthermore, the terrain factor has an important influence on the spatial distribution of soil erosion.