Abstract: In-situ carbonization of pre-oxidized fibre mixed with green petroleum coke powders without any binder to prepare C/C composites is an effective method to manufacture advanced C/C composites in a shorter period and with lower cost.But just like other C/C composites,the oxidation resistance of the material produced by this kind of technology is not satisfying even with oxidation resistant coating because of the different thermal expansion coefficients between the coating and the matrix.,and the crack problem will occur.A mixture of green petroleum coke,B 4C and SiC together with short carbon fiber is used as starting materials.The mixture is then press-formed without binding agent after grinding,dense and homogeneous bindless Carbon/Ceramic composites are then obtained after sintering.Composites thus prepared have excellent anti-oxidation property between 900-1000℃.Anti-oxidation mechanism is also discussed from the viewpoint of thermodynamics.