In order to study the influence of three kinds of high viscosity agents RA,PR.M and BRA on the road performance of asphalt mixture,two kinds of dense-graded asphalt mixtures AC-13C and AC-20C,which were commonly used in engineering,were researched under the action of water-temperature coupling.The performance of high temperature antirutting and anti-fatigue of high modulus asphalt pavement was studied from the aspects of gradation type of mineral aggregate,high viscosity agent,moisture content,test temperature,etc.The research results show that when the gradation type is the same,the type and content of high viscosity agent have little effect on the optimal oil-stone ratio of asphalt mixture.Under the same conditions,the water absorption and high temperature anti-rutting of AC-20C asphalt mixture are significantly greater than that of AC-13C asphalt mixture,and the high temperature anti-rutting performance of asphalt mixture adding RA high viscosity agent is the best as a whole.With the increase of test temperature,loading stress and water.