Two grading scale methods in the Chinese standard, exclusion method and hybrid method, are used to scale a kind of coarse aggregate. Triaxial consolidation drainage shear tests have been performed on samples of different particle sizes. The results show that when the confining pressure is the same, the peak stress (σ₁-σ₃)_f and friction angle φ obtained by the exclusion method are higher than that obtained by the hybrid method. Coarse-grained material acquired by the exclusion method has a stronger dilatancy. Besides, under the same confining pressure, compared with coarse-grained material obtained by the hybrid method, both ε_af and ε_v0 obtained by the exclusion method are smaller and its M₀ is higher. Lastly, under the same particle size, the secant elastic modulus obtained by the exclusion method is about 1.03 to 1.39 times higher than that obtained by the hybrid method. When the particle size increases, the bulk modulus obtained by the exclusion method increases less than that obtained by the hybrid method and the elastic modulus parameter K obtained by the two scale methods increases and the deformation modulus index n decreases.