Silicon-carbide-fiber-reinforced silicon-carbide-ceramic-based matrix (SiC/SiC) composites possess excellent properties such as low density, high strength and high temperature resistance, showing a potential application for structural components in the aerospace field, but their oxidation behavior remains largely unknown. In this study, Yb₂Si₂O₇ modified SiC/SiC (SiC/SiC-Yb₂Si₂O₇) mini-composites were prepared by introducing Yb₂Si₂O₇ as anti-oxidation phase into SiC fiber bundles via Sol-Gel and depositing SiC matrix by chemical vapor deposition (CVD). Influence of Yb₂Si₂O₇ on microstructure, mechanical property and oxidation behavior of SiC/SiC mini-composites was investigated. The results showed that after oxidation in air at 1200 and 1400 ℃ for 50 h, the tensile strength retentions of SiC/SiC mini-composites were 77% and 69%, respectively, and the fracture morphology exhibited flat. The Yb₂Si₂O₇ introduced by Sol-Gel partially distributed in layers, contributing to the toughening of the material. On the fracture surface, there was interlayer debonding, which extended energy dissipation mechanism of SiC/SiC mini-composites. Tensile strength of SiC/SiC-Yb₂Si₂O₇ mini-composites at room temperature was 484 MPa. After oxidation in air at 1200 and 1400 ℃ for 50 h, the tensile strengths decreased to 425 and 374 MPa, resulting in retention rates of 88% and 77%, respectively. It displayed typical non-brittle fracture characteristics. The interface oxygen content of SiC/SiC mini-composites at the fracture surface was higher than that of SiC/SiC-Yb₂Si₂O₇ mini-composites, indicating that introduction of Yb₂Si₂O₇ could alleviate oxygen diffusion towards the interface, and therefore improve the oxidation resistance of SiC/SiC-Yb₂Si₂O₇ mini-composites.