The　plasmonic　resonance　express　as　strong　extinction　band　and　great　enhancement　of　the　electromagnetic　field　in　the　vicinity　of　the　nanoparticles,　which　have　been　exploited　in　various　applications　such　as　data　storage,　super-resolution　imaging,　light　collimation,　solar　cells,　biosensors　and　absorbers.　However,　a　simple　and　effective　route　to　obtain　uniform　metal　nanoparticles　is　still　a　challenge.　Here,　we　have　demonstrated　a　cost-efficient,　lithography-free,　and　facile　methods　to　obtain　controllable　gold　nanoparticles　(GNPs)　for　structure　color　by　direct　ultraviolet　(UV)　laser　writing.　The　thermals　dewetting　process　realized　by　UV　laser　direct　writing,　greatly　simplifies　the　manufacturing　process　of　plasmonic　nanoparticles,　lowers　the　bar　for　equipment,　and　realizes　the　structure　color　in　selected　areas.　The　direct　laser　writing　process　is　performed　on　a　4　nm-thin　island-like　Au　films　atop　dielectric-metal　sandwiches.　By　local　laser　heating,　the　semi-continue　gold　film　merges　and　reshapes　into　approximately　spherical　structure,　generating　brand　colors.　The　structure　color　changes　as　a　function　of　the　laser　energy　density,　low　laser　energy　density　to　green　and　high　laser　energy　density　to　red.　Especially　for　lager　laser　energy　density,　the　processed　area　shows　a　high　saturation　Numerical　simulations　confirm　that　the　reflectance　of　the　processed　area　is　strongly　affected　by　the　absorption　of　the　bottom　metal　layer　and　the　local　surface　plasmon　resonance　of　the　top　GNPs.　In　addition,　the　top　GNPs　play　a　major　role　in　tunning　the　peak　of　reflection　spectrum.　©　2021　Institute　of　Physics　Publishing.　All　rights　reserved.