SiC/SiO2 core-shell nanocables in high yield and high purity were synthesized on carbon fiber felt by a simple thermal evaporation method without the presence of the catalyst. The microstructures and compositions of the samples were studied by SEM, TEM, HRTEM, EDS and SAED. The as-prepared nanocables with diameter of 10-40 nm have a crystalline SiC core and an amorphous shell of SiO2. This composite nanostructure will provide opportunities for both fundamental research and technological applications in electronic nanodevices.(c) 2005 Elsevier B.V. All rights reserved.