In this paper, the influence of different sintering temperatures on the microstructure, density, shrinkage and final phase content of hydroxyapatite-zirconia (HA-ZrO2) composites was studied. Composites of hydroxyapatite with 3 mol% Y2O3 stabilized zirconia with MgO were sintered between 1100 °C and 1400 °C. The reaction and the transformation of phases were investigated by X-ray diffraction and FTIR spectroscopic measurements. Those results indicated that the processes of HA dehydroxylation were found, the mean grain size of the sample sintered was varied from 1.2 µm to 5.3 µm. Dimension shrinkage increased to 0.24% as the sintered temperature increased from 1100 °C to 1400 °C, the bulk density increased monotonically to 95.6% with increasing temperature up to 1400 °C.