Abstract: BLT-C composites with BaCO3,La2O3,TiO2 and graphite as raw materials were prepared by hot-pressed sintering at 1 300 ℃ for 1 h in nitrogen atmosphere .The microwave attenuation performance,phase composition and microstructure were characterized using vector network analyzer,XRD and SEM.The effects of graphite content on microstructure and microwave attenuation performance were studied.The results showed that the compactness of the composites decreased with the increase of graphite content,but the microwave attenuation performance was improved by the addition of graphite.The BLT-C composites exhibited multi-selected frequency band attenuation.The attenuation increased with the increase of graphite content and the resonant peaks shifted to the lower frequency.