Thermal conductivity of SiCp /Al composites was simulated by finite element method.The four particle and multi-particle random distribution models of composites in plane were established.The effect of factors such as SiC particle volume fraction,particle diameter,particle shape and matrix metal on thermal conductivity of SiCp /Al composites were investigated.The results show that thermal conductivity of SiCp /Al composites decreases with increasing of SiC volume fraction.Thermal conductivity of the composites varies slightly with increasing of particle diameter.Thermal conductivity of the composites with sphere particle is higher than that of the composites with square particle.Thermal conductivity of the composites with ZL101 matrix is higher than that of composites with ZL102 matrix.