The effects of experimental conditions and polymeric additives on hydroxyapatite (HAP) crystallization were investigated by wet chemical synthesis. Polyacrylic acid homopolymer and styrene-acrylic copolymer were used as additive. The obtained HAP powders were characterized by X-Ray Powder Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and BET method. Thermal analysis (TG-DTA) was carried out to investigate the thermal stability of the powders. The result showed that the properties of HAP powders changed depending on the experimental conditions.