Abstract:Soil conservation (SC) is the primary ecological service function of the Loess Plateau, which is vital to the sustainable development of ecological economy in Loess Plateau. Therefore, it is necessary to carry out research on changes and its influencing factors of soil conservation in this area. In the context of Grain for Green Project, the spatiotemporal changes and its influencing factors of soil conservation services in Ziwuling (ZWL) from 2000 to 2017 were analyzed by using the InVEST Sediment Delivery Ratio Module, spatial autocorrelation, geographic detector and other methods. The results showed that a large amount of cultivated land in ZWL area changed into woodland and grassland from 2000 to 2017, and the soil conservation service showed an increase trend. Among them, the amount of soil conservation per unit area of woodland was the highest. The soil conservation service first increased and then decreased with altitude, and increased with the increasing of slope. The amounts of soil conservation in the west slope and east slope were the highest. The spatial autocorrelation of soil conservation variation was high in ZWL area, and the main aggregation types were high-high and low-low. The high-high concentration area located in the northeastern part of ZWL, and the low-low concentration area mainly distributed in the northwestern part. The changes of influencing factors had an interactive enhancement effect on soil conservation changes, and NDVI was the most important factor in high-high aggregation area. The low-low aggregation area was mainly affected by the changes of precipitation and land use intensity, and the insignificant area was weakly affected by each factor. The soil conservation changes of whole ZWL area were mainly affected by the changes of precipitation, GDP density, population density and NDVI.