Abstract: Non-orientation short BN fiber-reinforced HP Sialon Ceramic material was investigated by high speed blend.Ultrasonic disperse and HPsinterlng processes.Bending strengh and thermal shock resistance brhavior of the compositcs with different contcnts of BN fiber and diffcrcn HP sinteing temperatures were studied and discussed,the microstructure and crysta1 phase composition of the composites and the grain growth phenomena of the BN fiber before and after HP siatering were researched by TEM、SEM and XPD techniqres.