Abstract: To explore the degradation of shear deformation and friction sliding performance of laminated-rubber bearings during the service life of bridges in China's highway system, according to the specifications, hot air accelerated aging tests were conducted on the bearings, compression-shear tests were carried out on the bearings before and after aging, and their deformation status and hysteresis relationship were compared and analyzed. The quasi-isolation performance of the bearings for two types under different loading conditions were evaluated. The results show that the rubber curling and void warping degree of aged bearings are deepened, and the hysteresis loop is thinner and longer than that of new bearings. After aging, the shear deformation ability of the bearings is improved, the shear strain increases, and the shear modulus decreases. The change rate of shear modulus after aging of bearings is mostly within the JT/T 4 specification limit of ± 15%. The friction sliding ability of aged bearings decreases, the sliding displacement decreases, and the friction coefficient increases. The friction coefficient of aged bearings is positively correlated with sliding rate, and negatively correlated with surface pressure. The constitutive models of aged and new bearings can respectively use bilinear and trilinear methods to characterize the degradation of quasi-isolation performance of bearings during the service life of bridges, in order to provide evaluation basis and suggestions for the seismic performance of laminated-rubber bearings in the long-term operation of small-to-medium-span bridges.