Fractures, lesions and various bone deformations due to illness or trauma can result in slow recovery, years of health problems and great financial costs. Therefore, the task of bone tissue engineering is to offer new solutions in bone healing process by promoting the natural formation of new bone. Due to its biocompatibility, biodegradability, osteoinductivity and similarity to biological apatite, hydroxyapatite is considered the gold standard in the bone tissue engineering. Selenium shows antibacterial and anticancer properties and is an essential component in maintaining bone mineral density, so the aim of the research is to synthesize a calcium phosphate system that contains hydroxyapatite doped with selenite. With precipitation method from aquatic solution, calcium phosphate samples doped with 0, 1, 5 and 10 % selenite were synthesized, in which the used calcite was biomimetic. The samples were characterized by X-ray powder diffraction, Rietveld refinement, Fourier transform infrared spectroscopy and inductively coupled plasma mass spectrometry. The morphology was determined by scanning electron microscope. The results show successful doping of the calcium phosphate systems with selenite. The doping of this system with selenite ions leads to the formation of agglomerates, the loss of the original plate-like structure and decrease in crystallinity. Synthesized samples show lack of thermal stability. When thermally annealed at 1200 ℃, selenium does not lag behind, crystallinity is improved compared to as-prepared samples, and stability of HAp correlates positively with the selenite content.