In order to further study the deformation and intensity characteristics of soil-rock aggregate mixture, a series of triaxial tests were conducted by using a YS30-3 large-scale triaxial test machine based on the orthogonal design. These tests took into account various factors such as water content, stone content, rock and soil property, etc. The test results indicate that the soil-rock aggregate mixture under the triaxial stress conditions does not exhibit obvious characteristics of strain softening. The cohesion of soil-rock aggregate mixture is generally low and the internal friction angle is relatively high, while the internal friction angle is more susceptible to the influencing factors. Moreover, it is found that the rock content significantly influences on the strength of soil-rock aggregate mixture. As the rock content increases from 25% to 70%, the internal friction angle increases linearly from 34.54° to 46.39°. The effects of rock content and confining pressure are the internal and external causes on the volumetric strain characteristics of the soil-rock aggregate mixture, respectively. That is to say, with the same water content as well as rock and soil property, the lower the rock content, the more obvious the shear contraction of soil-rock aggregate mixture under the higher confining pressure. Meanwhile, the higher the rock content， the more obvious the shear dilatation of soil-rock aggregate mixture under the low confining pressure.