Large　area　exposure　of　bare　soils　caused　by　soil　erosion　has　serious　impact　on　the　regional　ecological　environment,　such　as　the　rise　of　land　surface　temperature.　As　a　typical　reddish　soil　erosion　region　in　southern　China,　the　hilly　areas　in　Changting　county　of　Fujian　province　have　been　called　flame　hill　areas,　due　to　extensively　exposed　reddish　soils　and　resultant　hot　weather　in　the　areas.　This　study　utilizes　remote　sensing　technique　to　investigate　dynamic　of　bare-soil　exposure　intensity　and　accompanied　soil　heat　flux　and　land　surface　temperature　(LST)　changes　during　the　period　from　1988　to　2010　in　main　soil　loss　areas　of　the　county.　Results　show　that　owing　to　the　22　yeas　of　treatment　of　soil　loss,　the　bare-soil　exposure　intensity　in　the　main　soil　loss　areas　has　declined　by　20.26%,　the　area　of　high　exposure　intensity　has　decreased　by　81.95%,　and　the　soil　heat　flux　has　reduced　by　33.28%.　All　of　these　have　contributed　to　the　decrease　in　LST　differences　between　exposed　and　vegetated　areas　by　20.8%　during　the　study　period.　This　indicates　an　improvement　of　thermal　environment　in　the　areas　once　severely　exposed.　Regression　analysis　suggests　that　each　10%　decrement　of　bare-soil　exposure　intensity　would　reduce　LST　difference　by　0.72-0.94°C.