Vegetation　is　an　important　basic　component　of　terrestrial　ecosystem　and　one　of　the　most　sensitive　factors　affecting　soil　erosion.　How　to　analyse　the　quantitative　relationship　between　fractional　vegetation　cover　(FVC)　and　soil　erosion　and　determine　the　sensitive　coverage　of　erosion　is　of　great　significance　for　guiding　government　departments　to　implement　soil　and　water　conservation　policies.　In　this　paper,　through　the　variable-controlling　mothed,　the　forest　land,　grassland　and　bare　land　in　Changting　County,　a　typical　red　soil　region　in　southern　China,　were　used　as　experimental　areas　to　study　the　sensitivity　of　FVC　change　to　soil　erosion.　The　soil　erosion　amount　was　calculated　by　RUSLE　model,　and　soil　loss　rate　(rsl)　were　used　to　characterize　soil　erosion.　The　results　show　that　when　FVC　changes　from　0　to　0.8,　the　fitting　curves　rsl　are　in　accordance　with　the　logistic　model　distributions,　with　a　high　coefficient　of　determination　R2,　and　the　sensitivity　of　rsl　is　less　sensitive　in　the　range　of　0∼0.05,　it　is　most　sensitive　when　FVC　reaches　a　certain　level,　and　there　is　basically　no　sensitivity　when　it　reaches　0.7　or　above;　the　fitting　curves　of　rsl　at　different　slope　levels　are　similar　to　their　overall　distribution,　which　are　consistent　with　the　logistic　models,　and　R2　is　above　0.99,　the　curves　of　rsl　at　each　slope　level　are　different　in　the　same　FVC　interval,　for　areas　with　poor　vegetation　coverage　(0∼0.2)　and　high　slope　(＞25°),　the　curve　is　less　sensitive　to　terrain;　rsl　generally　has　higher　sensitivity　in　the　range　of　0.2∼0.6　coverage;　in　areas　above　0.6,　the　sensitivity　decreases　to　zero.　©　Published　under　licence　by　IOP　Publishing　Ltd.