reflective diaphragm was coated with an ultraviolet resistant highly reflective coating and the adhesive formed adhesive layer the material of the bottom transparent diaphragm was pc with a thickness of 188 u03bcm and the thickness of the reflective diaphragm was 188 u03bcm the adhesive consisted of the high ortho thermosetting phenol resin inorganic zirconium borosilicon powders zirconium powders boron powders and silicon powders were mixed according to a weight ratio of 3 1 1 and ethyl acetate solvent with a weight ratio of 100 150 60 the white reflective diaphragm had 15 of nano modified calcium carbonate homogeneously dispersed therein and the modified cladding material of calcium carbonate was silicon dioxide the ultraviolet resistant highly reflective coating was a compound of silane crosslinked polyolefin titanium dioxide and zinc oxide with a content of 70 of titanium dioxide and zinc oxide and the ultraviolet resistant highly reflective coating was also added with the hindered amine photostabilizer and the benzotriazole ultraviolet absorber the composite optical reflective film was prepared according to the abovementioned method the material of the bottom transparent diaphragm was pet with a thickness of 188 u03bcm and the thickness of the reflective diaphragm was 188 u03bcm the adhesive was epoxy resin the white reflective diaphragm had nano modified titanium dioxide homogeneously dispersed therein and the modified cladding material of titanium dioxide was silicon dioxide and aluminum oxide the ultraviolet resistant highly reflective coating was a compound of silane crosslinked polyolefin titanium dioxide and zinc oxide with a content of 50 of titanium dioxide and zinc oxide and the ultraviolet resistant highly reflective coating was also added with the hindered amine photostabilizer and the benzotriazole ultraviolet absorber the composite optical reflective film selected an ordinary adhesive for usage which had poor dimension stability the performance test.