In order to obtain the suitable gradation range for waste crumb rubber/SBS composite modified asphalt CR/SHMA-13 asphalt mixture,through gradually filling test of coarse aggregate, percent voids in mineral aggregate and skeleton strength were used as evaluation indexes to determine the optimum ratio of coarse aggregates of all particle sizes between the main skeletons. The proportion of coarse and fine aggregate was determined by the volumetric design method,then the gradation of the CR/SHMA-13 mixture was optimized by orthogonal test. The gradation range applicable to the CR/SHMA-13 mixture was recommended according to the rangeanalysis. The results show that the pavement performance of the CR/SHMA-13 mixture is comparable to that of SMA-13mixture,but is better than that of the conventional AC-13 mixture.