In this paper,polyaspartate resin and polycarbonate polyol were used as the base resin,and the elastic polyurethane coating was prepared by a two-step m ethod.The prepolym er was first prepared by polycaprolactone polyol and isophorone diisocyanate,and then m ixed with HDI tripolym er as curing agent.The polycarbonate polyol and HDI tripolym er were used to adjust the resilience and hardness of the coating.The effects of m olecular weight of polycaprolactone polyol,content of prepolym er isocyanate and chain extension coefficient R on the elongation at break and tensile strength of the coating film,the effects of the dosage of polycarbonate and HDI tripolym er on the resilience and hardness,and the effects of the m ain com ponents of the coating system and the different dosage of various ultraviolet absorbers on the weather resistance were discussed.The results showed that when R value was 1.05,1000 m olecular weight polycaprolactone polyol was soft segm ent,equivalent ratio of PCDL∶NH1420∶PCL prepolym er∶N3390 was0.3∶0.7∶0.65∶0.4,and UV absorber T249 was added 2%,the overall perform ance of the coating was the best,it can m eet the technical indicators of rubber windshield protection coatings.