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Bone possesses high strength and toughness which owes to its excellent nanostructures.The detailed research on the nanostructures of bone can provide profitable guidance for developing synthetic high-performance bone-mimetic composites.In this work,scanning electron microscope (SEM) is used for observation of the nanostructures of a connon bone.The observational result shows that the bone is a kind of bioceramic composite consisting of collagen and nano-hydroxyapatite fibers.