Urban　build-up　areas　have　been　overdeveloped　with　the　accelerated　urbanization　process　in　China.　This　has　caused　significant　degradation　of　regional　eco-environment.　In　order　to　study　the　thermal　environmental　change　initiated　by　the　development　of　Puxiazhou　wetlands　in　Fuzhou,　Southeast　China,　the　part　of　the　wetlands　was　developed　to　a　local　exhibitation　center,　two　Landsat　TM　images　in　2006　and　2010　were　utilized　to　perform　feature　extraction　of　thermal-related　information　of　the　wetlands.　The　extracted　feature　information　included　built-up　land,　fractional　vegetation　coverage,　wetness,　and　land　surface　temperature.　The　analysis　on　the　changes　of　the　above　thermal-related　feature　information　revealed　that　the　development　of　the　wetlands　to　the　exhibition　center　had　caused　the　reduction　of　wetness　and　fractional　vegetation　coverage　by　10.00%　and　25.64%,　respectively,　and　the　increase　in　built-up　index　value　by　13.85%.　Consequently,　the　land　surface　temperature　of　the　wetlands　has　risen　by　48.39%.　Obviously,　the　development　of　the　Puxiazhou　wetlands　to　the　exhibition　center　had　resulted　in　the　intensive　land　use　change.　The　conversion　of　green　and　water　areas　to　built-up　lands　had　raised　the　land　surface　temperature　and　thus　changed　the　thermal　environment　of　the　wetlands.