In grey entropy correlation analysis, the determination of resolution coefficient is the key factor that restricts the analysis result. In this paper, the formula of resolution coefficient was deduced firstly. On this basis, the mixed recycled coarse aggregate was prepared through indoor preparation, and the influence of waste brick on the physical properties of mixed recycled coarse aggregate was studied by the road technical requirements of coarse aggregate. The influence of mixed recycled coarse aggregate on the mechanical properties of cement stabilized macadam was analyzed by the unconfined compressive strength test, and the relationship between the performance index of mixed recycled coarse aggregate and the unconfined compressive strength was analyzed by the grey entropy analysis theory. Through the method of nonlinear data fitting combined with the traffic load grade and the highway grade, the applicable range and the classification of the mixed recycled coarse aggregate were determined in the road engineering base. The results show that the value of resolution coefficient is not fixed, which the maximum and minimum value is 1.000 and 0.141, respectively. The amount of mixture recycled coarse aggregate replacing limestone aggregate does not exceed 20% (mass fraction). Moreover, the proportion of bricks in the mixed recycled coarse aggregate is related to the traffic load grade, and its value could not exceed 40% (mass fraction). Through the grey entropy correlation analysis, the water absorption rate and crushing value are used as grade indexes of the mixed recycled coarse aggregate, of which the application grades are divided into three categories in road engineering.