In this paper is presented a synthesis method of calcium phosphate bioceramics such as hydroxiapatite, the mineral component of bones and hard tissue in mammals. Hydroxyapatite powders have been obtained by chemical coprecipitation, by using calcium hydroxide and ortophosphoric acid as a source of calcium and phosphorus. The synthesized powders were characterized by X – ray diffraction, dynamic light scattering technique (DLS) and scanning electron microscopy (SEM). The proposed method lead to obtain a hydroxyapatite with a degree of crystallinity, greater than 80%, in case of all samples thermal treated at 8000C.