Excellent irradiation stability has been reported for SiC at wide temperature ranges and damage levels under neutron irradiation.The Fukushima accident once again stimulated the research a fuel material that can maintain fuel integrity to higher temperatures under normal and accident conditions for longer periods of time.The use of SiC in nuclear power applications,such as fuel cladding,has received increasing attention over the past decade and has been discussed as a critical need over the past two decades.Reaction sintering of the SiC ceramics has the advantages of low temperature and net shape production.But the high temperature performances of SiC were degraded by residual silicon.In the present paper,multi carbon source for the preparation of SiC ceramic material is proposed.With the carbon source with different reaction activity as raw material,SiC-carbon-silicon composite materials with controllable microstructure were firstly fabricated by reaction sintering,and then SiC ceramics with low residual silicon was obtained through diffusion reaction between carbon and silicon aroused by high temperature treatment.The graphitization degrees of carbon sources were determined by combining XRD and Raman spectra analyze.