The application of crumb rubber in asphalt pavement was introduced.The problems of low mechanical strength,difficult compaction and swell of crumb rubber dry modified asphalt mix were pointed out.According to the analysis of mechanical strength of dense gap-graded asphalt mixes,the design method for CRUMAM was given,which was the employing of gap-graded dense skeleton structure together with polymer modified asphalt.The results of the lab tests show that CRUMAM has good high temperature stability,low temperature crack resistance and water susceptibility confirmed.