In this work, we investigated the synthesis of nano-sized Si-HA powder by a microwave assisted chemical precipitation process. This method is quite capable of yielding nano-structured high purity material with a high yield and interesting microstructure. We have characterized the as-synthesized and calcined HA and Si-HA powders structurally using X-ray diffraction (XRD), scanning electron microscopy (SEM) and dynamic light scattering (DLS) techniques and spectroscopically using Fourier transform infrared (FT-IR) and EDS technique.