To improve the stability of the ballast bed, the glue-solidified treatment was applied on the ballast to form a stable ballast bed (namely glue-solidified ballast bed) in the maintenance of the railway. According to the characteristics of the glue-solidified ballast bed, the ratio of Polyisocyanate (Group A) and Polymer polyols (Group B) in the ballast particle gradation and polyurethane binder was selected as variables. The mechanical properties of the glue-solidified ballast bed with two gradations and three ratios of ballast rubber were studied. The geometry of ballast particles was built by three-view stereo reconstruction to obtain the realistic structure of the ballast particle. In discrete element software, a complete ballast curing ball bed model was established and simulated based on the bond model. The results show that in the glue-solidified ballast bed, a wide gradation and A:B=3:2 the ballast rubber ratio of A:B=3:2 are more favorable to improve the mechanical properties of ballast bed.