The　estimations　of　thirteen-year　interval　vegetation　fractional　coverage　(VFC)　of　Genhe　forest　reserve　area　were　conducted　using　Landsat-5　TM　data　acquired　in　2000　and　GF-1　images　in　2013　based　on　the　dimidiate　pixel　model.　The　changes　of　VFC　and　the　relationships　between　VFC　and　topographical　factors　were　analyzed.　Validated　against　the　field　measurement　conducted　in　August　2013,　the　estimation　of　VFC　using　GF-1　image　was　reliable　(R　2　=　0.52,　RSE　=　0.54).　The　factor　that　was　most　positively　correlated　to　the　VFC　was　the　altitude,　followed　by　the　slope.　The　VFC　declined　generally　from　2000　to　2013　and　the　high　level　of　VFC　experienced　the　most　obvious　change.　In　particular,　both　VFCs　in　2000　and　2013,　as　well　as　their　differences　which　were　mostly　positive,　increased　with　the　altitude　until　1027　m,　above　which　the　VFC　changed　slightly.　Forest　fires,　rich　drainage　and　forest　tending　had　great　impacts　on　the　decrease　of　VFC　in　the　low-altitude　mountainous　region.　©　2016,　editorial　Board　of　Chinese　Journal　of　Ecology.　All　rights　Reserved.