When a double bond is contained in the polymer material, the double bond is easily opened by ultraviolet rays in sunlight having a large energy intensity, thereby decomposing the polymer material. And asa replaces the butadiene rubber containing unsaturated double bonds in abs with acrylic rubber containing no unsaturated double bonds. Therefore, it not only resists degradation, aging, fading caused by ultraviolet radiation, but also oxidizes in the atmosphere. The high temperature during processing causes a strong protection of the decomposition or discoloration of the asa, which greatly improves the anti-aging and weather resistance of the material. According to the test results, the anti-aging performance of asa is more than 10 times that of abs.