Abstract: Developing composite materials with high thermal conductivity and high mechanical properties plays a positive role in alleviating the problems such as high bed temperature, increased pollutant emissions, and limited peak regulation capacity in circulating fluidized bed boilers. Using Zirconium corundum, silicon carbide, alumina and graphene with different particle sizes were used as main materialsand graphene, BN、AlN and CNTs as thermal fillers, and calcium aluminate cement as a binder, high thermal conductivity composites were prepared through mechanical blending and certain modification treatments. The effects of different processes on the dispersibility, thermal conductivity, and mechanical properties of the composite materials were studied. The results show dispersibility has an important impact on the overall performance of the material. Good dispersibility can not only enhance the wear resistance and mechanical strength of the material but also its thermal conductivity. Effective combinations of modifiers can synergistically improve the dispersibility of the material. Single modifiers result in decreased dispersion. Unmodified materials show significantly reduced dispersion. Surface modification with Graphene Oxide can significantly improve the dispersibility of the material. The addition of BN, AlN, and CNTs significantly improves the thermal conductivity of the material. The alumina coating treatment is crucial for improving the mechanical properties and wear resistance of the material, but it has a weaker impact on the thermal conductivity.