SiO2/ZrO2-SiO2 composites were fabricated by sol-gel method, and then the flexural property of SiO2/ZrO2-SiO2 composites was discussed.The results showed that SiO2/ZrO2-SiO2 composites were fabricated by sol-gel method.No obvious pores are existed.The SiO2 fibers are covered by ZrO2-SiO2 sol, which show a better fiber/matrix interfacial bonding.The flexural strength at room temperature is 100.8MPa, and the elastic modulus is 29.19GPa.There are mainly fibers bundles pull-out when the load reaches at the maximum.The matrix fails when the stress reaches the maximum, the samples show a typical ductile/gradual fracture behavior.After high-temperature oxidation, the fracture mechanism of the composites changed, which showed typical brittle/sudden fracture.The fracture mechanism is brittle mode.The flexural strength and elastic modulus of the samples after 1200℃ oxidation are about 50.51MPa and 31.51GPa, respectively.Compare to SiO2/SiO2 composites, SiO2/ZrO2-SiO2 composites showed higher flexural strength and higher elastic modulus.SiO2/ZrO2-SiO2 composites, which fabricated by sol-gel method, show long time usage at higher temperature.