Abstract: In order to meet the working requirements of a solid rocket nozzle throat, the anti-ablative properties of 2D Cf/SiC composites have been improved by decreasing surface temperature by Cu boil off in ablative conditions. 2D Cf/SiC-Cu composites with different Cu contents (2.18vol%,4.86vol%,6.53vol %) were prepared via precursor infiltration and pyrolysis, and their mechanical and ablative properties were investigated. Results indicated that with increasing Cu content, the flexural strength decreased from 261.07MPa to 203.61MPa to 164.91MPa, and the fracture toughness also decreased from 13.4MPa·m1/2 to 12.5MPa·m1/2 to 11.8 MPa·m1/2. The composites all retained structural integrity after 30 seconds ablation in an oxyacetylene torch, but flexural strength decreased to 121.16Mpa to 140.23MPa to 122.87MPa, and the corresponding mass ablations were 0.036g/s, 0.050g/s and 0.064g/s. The 2D Cf/SiC-Cu composites have low density, high strength and low ablative loss compared with other throat materials.