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Electronic structure and morphology of hydroxyapatite (HAP), deposited on titanium substrate by gas detonation deposition (GDD), was investigated by scanning probe microscopy of high resolution and spectroscopic methods. Nanoscale structure formation of the coatings in the form of nano-dispersed ceramics was determined. Effects of more advanced surface in the transition of HAP from the crystalline (powder) to nanodispersed (coating) state was studied. It is revealed that the elemental composition of GDD cover surface and subsurface layers remains stable up to the depth of 50 nm. The change of elemental composition of GDD cover subsurface layers in the direction of increasing the calcium and phosphorus content was observed in the range 50-150 nm.