A promising method for changing the surface state of metals and influencing product design is plasma electrolytic oxidation (PEO) as one of the innovative surface treatment methods. The PEO method allows for a wide range of surface modifications, either by strengthening it or by changing its structural and morphological state. Materials scientists associate high osseointegration with the biocompatible and bioactive properties of implants. Titanium and zirconium alloys are characterized by an excellent combination of a complex of mechanical and chemical properties with inertness to a living organism, which is ensured by their ability to form a passive film on their surface. Such alloys are used in the field of implantology and for the manufacture of surgical instruments and implants. In order to increase osseointegration, the modification of the surface of such alloys with bioactive substances is positive, as well as the influence in the direction of modifying its design, which includes increasing the roughness and porosity of the surface. In this work, the PEO method was used for surface treatment of titanium and zirconium alloys. Experimental studies have established the correlation of the influence of treatment modes, such as the composition of the electrolyte and the ratio of current densities on the roughness and porosity of plasma electrolytically oxidized coatings at their optimal thickness. The developed alkaline electrolytes were additionally saturated with such biocomponents as diatomite and hydroxyapatite.