［Purposes］ This work aims to study the effect of nano-SiC on aging resistance and micro mechanism of asphalt.［Methods］ The rolling thin film over test (RTFOT) and pressure aging vessel (PAV) test were used to conduct short-term and long-term thermal oxygen aging on A-70^# matrix asphalt and nano-silicon carbide (SiC) modified asphalt with the mass fractions of 3%、6% and 9%. The traditional physical properties test, dynamic shear rheological test (DSR), bending beam rheometer (BBR) and fourier transform infrared spectrum (FTIR) were carried out on asphalt before and after aging. ［Findings］ The physical property aging index and rheological aging index results consistently show that the 6% of SiC is the optimum dosage.［Conclusions］ The addition of nano-SiC could improve the high-temperature stability and aging resistance of asphalt, but it is detrimental to thelow-temperature crack resistance. SiC could effectively inhibit the formation of carbonyl and sulfoxide functional groups in the aging process, preventing the further aging and hardening of asphalt.