Abstract: The composites of hydroxyapatite(HA) nanocrystals with polycaprolacton(PCL) prepared through solvent-cast technique were immersed in Simulated Body Solution(SBF) to examine its bioactivity.Their structure and component were characterized by means of scanning electron microscopy(SEM),X-ray diffraction(XRD) and Fourier transform infrared(FTIR).The results show that the surfaces of HA/PCL(w_(HA)=0.30) composites are covered by a coating of carbonated hydroxyapatite(CHA) with low crystallinity,and the composites is in high bioactivity.