Long rod-like,short rod-like and spherical nano-hydroxyapatite(HAP) was controlled synthesized using polyvinylpyrrolidone(PVP) as a template.The obtained hydroxyapatite was investigated by X-ray diffraction(XRD),Fourier-transform infrared spectroscopy(FTIR),thermogravimetric-differential thermal analysis(TG-DTA) and transmission electron microscopy(TEM).The experimental results showed that the crystallinity of HAP decreased with the incresing of contents of PVP,and a strong chemical bonding exists between t...