Abstract: Indoor accelerated aging tests were conducted on nano modified polyurethane weather resistant coatings and fluorocarbon super weather resistant coatings, through analysis the glossiness, SEM, FTIR, and corrosion at scribe to study the aging behavior of the two coatings. The results showed that during the 38 cycles of accelerated aging test, the glossiness, microstructure, and chemical functional groups of the two coatings did not change significantly with the aging time. The fluorocarbon super weather resistant coating was slightly better than the nano modified polyurethane weather resistant coating in terms of light retention and chemical stability; Nano modified polyurethane weather resistant coatings exhibit coating blistering earlier. Nano modified polyurethane weather resistant coating exhibits peeling of finish and primer in the early stages of aging as affected by multiple factors such as aging, high hardness and brittleness of the finish, and adhesion performance between the finish and primer. However, based on the corrosion width of the scribe, the long-term aging resistance of fluorocarbon super weather resistant coatings is superior to that of nano modified polyurethane weather resistant coatings.