Hydroxyapatite-collagen composite is a prosperous biomaterial in reconstructive surgery for the reparation of defects in human hard tissue. Within this. research, three-dimensional blocks of HAp/colkagen composite biomaterial were synthesized by homogenizing a HAp/collagen mixture and its subsequent cold and hot (T=60degreesC) pressing (P=49 MPa). The changes in the system were registered by, thermal analysis (DSC & TGA), FT-IR spectroscopy, and scanning electron microscopy.(SEM). Identification and the kinetic analysis of phase transitions were made. FT-IR spectrum of the biocomposite shows that neither cold nor hot pressing had significant influence on the individual components of the composite. SEM of the fracture surfaces showed that more intimate contact between the phases took place during the hot consolidation. The obtained results suggest destruction of the native but not of the primary structure of collagen molecules. Such a slight modification of collagen molecules can possibly lead to the elimination of antigenicity effects after implantation. of this kind of biomaterial into a human body.