The heterogeneity of soil and rock aggregate（SRM）determines its different mechanical properties under equal stress and equal displacement loading conditions.Based on the software of CDEM and the random generation algorithm of rock block and applying equal displacement and equal stress load conditions respectively，we study the uniaxial compressive strength of soil-rock aggregates and obtain the constitutive curves of aggregate with different rock contents.The results show that:1)The strength under equal stress load condition is lower than that under equal displacement load condition.And the difference becomes larger with the increase of rock content;2)With the increase of rock content，the compressive strength of the composite gradually increases.And after the rock content exceeds 30%，the compressive strength increases more quickly;3)With the increase of rock content，SRM’s macroscopic stress-strain curves show gradual strengthening tendency.