Abstract：After brief introduction of geological processes responsible for rock global circulation，the topic of geological nature of rock is put forward and discussed with emphasizing the intrinsic properties of rock substance，structure and occurrence state，as well as its close relationship with geological evolution. The difference between rock and other artificial material lies in the geological nature of rock formed in the geological evolution. Based on the recognition of rock nature，the origin of physical inherent properties is discussed including heterogeneity and discontinuity，and their relations with geological nature are also discussed. Brief discussion on constitutive property in rock mechanics is made. The paper attempts to establish a knowledge path from geology to rock mechanics for further collaboration.
