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Nano diamond coated/nano aluminum oxide composite powders were prepared by detonation using Nano-diamond,boron anhydride,aluminum sols in this article.The testing ways as XRD,TEM,and SEM were brought to observe and analyze the detonation products.As the result of the high temperature and high pressure produced by the detonation of the explosive,the particle size of composite powders which have nano diamond in the center and nano aluminum oxide coated outside exist 40~130nm and the balls are uneven distribution.