Abstract: The increasingly frequent ice rock avalanche hazards on the Tibetan Plateau pose a serious threat to human life and major projects. From the perspective of engineering geology and geological mechanics, this paper deeply analyzes the characteristics and genesis mechanism of typical ice rock avalanches, and establishes their geological mechanics patterns. The steep terrain and diversified structure provide the spatial and boundary conditions for the formation of ice rock avalanches. The earthquake promotes the further cracking and fragmentation of the ice rock mass, and the climate warming leads to the infiltration of meltwater along the fissures and boundaries, which significantly reduces the strength of the sliding surface (band), and even forms a short-term high-pressure water head, thus triggering the ice rock avalanche. The "discontinuity" serves as the critical threshold for ice rock avalanches, primarily manifested through instantaneous or progressive failure in the bonding between unstable zones, lateral walls, base beds, and parent glaciers. Ice rock avalanches on the Tibetan Plateau can be categorized into four geological mechanics patterns: the creep-fracture type (subdivided into "loading-induced pressure melting-water-induced creep-fracture" and "weathering-induced water-induced creep-fracture"), creep-toppling type, wedge slip type, and collapse type (subdivided into "cave collapse" and "erosion collapse"). These patterns may coexist, interact, and chain disasters within the same glacial basin.