Radiation　cooling　technology　can　effectively　reduce　the　energy　transmission　of　the　sun　to　the　building　during　the　day,　thus　playing　a　certain　positive　role　in　alleviating　the　urban　heat　island　effect　and　reducing　energy　consumption.　In　this　study,　red　Nd-doped　gamma-Ce2S3　and　orange　La-doped　gamma-Ce2S3　were　prepared　by　the　green　synthesis　method,　and　their　morphologies　and　optical　properties　were　systematically　studied.　The　color　film　produced　by　mixing　the　prepared　microcrystalline　powder　with　poly(vinylidene　fluoride-hexafluoro　propylene)　at　a　certain　proportion　has　near-infrared　reflectivity　and　superior　environmental　resistance,　achieving　effective　cooling　of　3-6　degrees　C　when　applied　to　the　building　surface.　This　study　expands　ideas　for　energy-efficient　building　materials　and　enriches　the　path　to　a　carbon　neutral　sustainable　future.