Zhangjiangkou　Mangrove　Forestry　National　Nature　Reserve　is　the　largest　Avicennia　marina　forest　in　China,　which　is　located　in　Yunxiao,　Fujian,　China.　The　total　area　is　about　2　360　ha.　It　is　the　only　National　Nature　Mangrove　Reserve　in　Fujian.　There　are　688　species　of　plants　and　animals　in　the　reserve.　It　provides　habitat　and　nursery　areas　for　many　commercially　important　fish　and　crustaceans.　They　also　play　important　roles　in　shoreline　protection,　chemical　buffering,　water　quality　maintenance,　recreation　and　education,　and　as　reservoirs　of　genetic　materials.　During　the　past　decades,　the　reserve　and　the　area　surrounded　has　been　changed　due　to　the　environmental　pollution　problem,　human　activities,　urbanization　development,　and　other　social/economic　issues　imposed　on　it,　which　brought　on　a　series　of　responses　of　regional　eco-environment　and　the　variation　of　its　ecosystem　service　values.　Thus,　there　is　an　increasing　need　to　monitor　and　assess　the　reserve　change,　both　to　gain　a　better　understanding　of　their　basic　biology　and　to　help　guide　conservation　and　restoration　efforts.　In　this　study,　in　order　to　determine　the　change　of　the　ecosystem　service　values　in　the　reserve　and　the　area　surrounded,　TM　images　taken　on　29　November　1989　and　8　December　1998　and　an　Aster　image　on　27　October　2003　were　used.　In　the　classification　procedure　involved,　the　images　in　1989,　1998　and　2003　were　classified　into　8　land　use　types,　including　paddy　(paddy　cropland),　mangrove　(mangrove　forests),　built-up　(urban/built-up　area),　forest,　barren　ground,　water　(river　and　lake),　beach,　ponds　(brackish　water　fishponds),　using　the　conventional　supervised　Maximum　Likelihood　Classification　Algorithm,　considering　8　initial　classes　(training　areas)　and　using　the　Mahalanobis　distances　as　the　clustering　parameter.　Then　these　land　use　changes　during　1989-2003　were　summarized.　Among　the　land　use　changes,　the　change　of　ponds　was　the　center　of　attention　during　the　2　periods.　Another　significant　change　was　the　decline　in　barren　during　1998-2003.　Over　the　1989-1998　and　1998-2003,　there　has　been　some　expansion　of　mangrove　profiting　from　the　establishment　of　the　reserve　in　1997.　The　changes　of　land　use　and　ecosystem　service　value　were　analyzed　using　Costanza　method　of　evaluating　the　global　ecosystem　service　values.　Based　on　coefficient　of　ecosystem　service　value　and　the　land　use　data,　ecosystem　services　value　was　calculated.　The　ecosystem　service　value　in　the　study　area　was　in　overall　decline　in　the　past　14　years.　The　total　values　of　ecosystem　services　in　the　study　area　were　2　945.　95　x　104　$　in　1989,　2　904.05　xl04　$　in　1998,　2　730.82　x　104　$　in　2003　respectively.　The　total　value　change　of　ecosystem　service　per　year　was-4.66　x　104　$　during　1989-1998,　and　it　aggravated　to-34.65　x　10　4　$　during　1998-2003.　The　results　indicated　that　the　ecosystem　service　value　in　the　study　area　has　been　constantly　deteriorating　due　to　the　human　activities　imposed　on　it,　which　is　highly　associated　with　the　local　expanding　of　build-up　and　brackish　water　fishponds　all　the　while.　And　the　downward　trend　of　the　ecosystem　service　value　has　become　even　more　acute,　with　the　development　of　the　local　economy.　Therefore,　to　improve　ecological　environment　of　the　reserve,　the　ecosystem　service　value　should　be　calculated　and　given　enough　weight　in　the　local　policy　decisions　in　the　future.