In　Hong　Kong,　reclamation　is　the　main　method　for　developing　new　land　use　areas　as　most　country　parks　and　mountains　are　protected　under　a　land　policy　that　emphasizes　conservation　for　their　high　ecological　value.　Therefore,　the　land　use　for　urbanized　area　in　Hong　Kong　is　limited,　which　has　become　an　issue　of　concern.　Hong　Kong＇s　population　is　increasing;　however,　the　amount　of　available　land　use　is　insufficient　to　meet　the　demand.　Developing　a　high　density　of　buildings　is　one　of　the　critical　strategies　of　Hong　Kong＇s　government.　Highly　dense　development　may　result　in　an　urban　heat　island　as　well　as　health　problems.　In　this　study,　we　present　an　assessment　of　urban　impervious　surface　changes　in　coastal　megacities　like　Hong　Kong　based　on　satellite　images.　Landsat　satellite　images　are　employed　to　analyze　urban　impervious　surface　changes　from　1995　to　2015　in　coastal　urban　areas　of　Hong　Kong.　The　results　show　that　the　increase　of　impervious　surface　area　is　almost　the　same　as　the　increase　in　land　reclamation　area.　This　suggests　that　Hong　Kong＇s　land　use　policy,　which　underlines　conservation　for　high　ecological　value　and　reclamation,　may　be　able　to　maintain　its　sustainable　development　of　coastal　land　use.