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Hydroxyapatite (HAP) nano-powder was synthesized in a used precipitation reaction, in which calcium nitrate 4-hydrate [Ca(NO 3 ) 2. 4H 2 O] and diammonium hydrogen phosphate [(NH 4 ) 2 HPO 4 ] were used as precursors and ammonia was used as the agent for PH adjustment. Hydroxyapatite powder has been studied at different firing temperature i.e 600, 700, 800, and 900 o C to achieve high degree of crystallinity and purity. The synthesized samples were characterized by Fourier Transform Infra-red Spectroscopy (FT-IR), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) techniques. The result shows that, high purity of nano-hydroxyapatite powders can be obtained at 600 o C, and the crystallinity and Magnification show formed rod of nano-sized grain.

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