Graphene　oxide-supported　uniform　Ag@AgCl　core-shell　nanoparticle　composites　have　been　successfully　prepared　by　a　facile　two-step　synthetic　process.　First,　graphene　oxide　sheets　were　used　as　carriers　to　anchor　and　disperse　Ag　nanoparticles　on　their　surface.　Then　these　fixed　Ag　nanoparticles　on　carbon　sheets　are　utilized　as　precursors,　around　which　AgCl　nanocrystals　form　in　situ　using　FeCl3　as　oxidant,　forming　graphene　oxide-supported　Ag@AgCl　core-shell　nanoparticle　composites.　The　composition　of　these　attached　Ag@AgCl　core-shell　nanoparticles　can　be　easily　controlled　by　adjusting　the　usage　of　FeCl3,　resulting　in　the　formation　of　controllable　core-shell　nanostructures.　Furthermore,　these　as-prepared　graphene　oxide-Ag@AgCl　nanoparticle　composites　display　effective　photodegradation　of　methylene　orange　dye　under　visible　light　irradiation,　which　indicates　their　potential　applications　in　environmental　areas.