Abstract: Connection structure design and strength assessment of Ceramic Matrix Composite (CMC) are crucial for its application in high temperature bearing components of aero engines. In this study, for the first time, the double shear performance test and failure analysis of SiC_f/SiC ceramic rivet at room temperature and 1300 ℃ air environment were carried out, verifying the feasibility of SiC_f/SiC rivets applied to the connection of CMC structures. The results show that the mechanical properties of SiC_f/SiC are somewhat diminished at high temperatures. Compared with room temperature conditions, both the shear stiffness and shear strength of ceramic rivet decrease significantly at high temperature. However, SiC_f/SiC demonstrates good resistance to high-temperature oxidation, with no signs of oxidation found in the fracture surface and within the specimen. SiC_f/SiC rivet suffers brittle fracture under shear load, while SiC fiber fracture is cleavage plane fracture, displaying obvious mirror-like, stepped and feathery features. These stepped and feather fracture characteristics are more prominent at high temperatures. Additionally, the load-bearing capacity of CMC rivets is affected by the angle between the macro load-bearing direction and the mesoscopic fiber layup direction. When the load-bearing direction is aligned with the layup direction, CMC rivets have higher shear stiffness. Besides, as the angle increases from 0° to 90°, the shear stiffness of CMC rivets gradually decreases.