Abstract: Design of funtional gradient materials(FGM)was introduced.Proper materials we re choosen from several candidate raw materials firstly for the carbon/carbon/Al₂ O₃ ceramic FGM.And then the FGM was prepared by suitable process routing.The ingredient distribution,microstructure of the materials,the ablative properties and the thermal properties were stud ied.From the interior to exterior surface of the FGM,the content of carbon changes from 88%to 15%,and on the other hand,the content of Al₂ O₃ changes from 12%to 85%.In the interior surface of the FGM,the ablative ra te of the material is about 0.012mm/s,whi ch is the characteristic of carbon-carbon composites,tested by O₂-C₂ H₂ ablation test.And in the exterior su rface,the thermal conductivity of the material is about 0.86W/m·K(25 ℃),which represents good heat-resistance property.