UV　curable　organic-inorganic　hybrid　(OIH)　coatings　were　used　to　modify　the　extruded　polystyrene　foam　(XPSF)　surfaces　to　increase　the　bonding　strengthen　(BS)　of　XPSF/mortar　composite　(XMC).　OIH　coatings　contained　polyurethane　acrylate,　hexanediol　and　nanoparticles　with　different　dimensions.　With　the　addition　of　nano-SiO2　and　halloysite　nanotubes,　the　BS-D　(BS　in　dry　state)　&　BS-W-2H/7D　(BS　in　wet　state　after　2-hour/7-day　drying)　values　for　modified　XMC　were　increased　from　0.050　&　0.039/0.047　MPa　to　0.245　&　0.196/0.356　and　0.312　&　0.233/0.323　MPa.　The　chemical　bonding　between　SiO2/-COOH　from　UV　coating　and　hydration　products　in　mortar　improved　the　bonding　state.