The stress concentration and fracture form of C/SiC riveted joints under shear load were investigated by using a FEM model and its accuracy was validated by experiments. The calculation results show that the stress concentration in C/SiC riveted joints is reasonable under shear load and the riveted joints in given size will be damaged in shear fracture form. All riveted joints are damaged in shear fracture form in the experimental validation. All of the starting fracture points occur at the inner of junction plates, which demonstrates that the established model for analysis of fracture form of C/SiC rivet is correct.