In order to study pavement performance deterioration law of asphalt mixture after ultraviolet（UV） aging, the nonlinear equation of road performance of asphalt mixture was established by Verhulst model, and the parameters in the nonlinear equation were estimated by Levenberg Marquardt（LM） algorithm and the least square method. The reliability of the nonlinear equation was verified through the pavement performance tests of AC 13 and AC 16 asphalt mixture at the different times of UV aging in lab. The results show that the LM algorithm is more reliable than the least square method to estimate the parameters in the nonlinear equation, the nonlinear equation can accurately predict the low temperature splitting strength and dynamic stability of asphalt mixture, the maximum errors between the calculated values and experimental values are 035%, 764%（AC 13 asphalt mixture）and -081%, -1145%（AC 16 asphalt mixture）. The reduction of UV aging rate and UV aging residual index for road performance of asphalt mixture are remarkable after 194h UV aging in lab （28712 h UV aging outside）,and with the increase of UV aging time in lab, the UV aging rate and UV aging residual index tend to stable.