The main processes of Eurasian mineral waters formation are the exchange reactions, hydrolytic leaching of sedimentary rocks and hydro-injection unloading of deep gas fluids into the water-bearing bedded system of mesocainozic along the system of through tectonic racks. Water chemical composition is determined by processes of waters mixing of different horizons, such carbon dioxide, fresh and highly mineralized relict waters. Natural waters are characterized by total mineralization, dissolved carbon dioxide, pH value, electroconductivity and other physical and chemical parameters. A great number of mineral water deposits are successfully operated on the Eurasian continent where chemical composition is similar to each other because of genetic similarity of geological conditions of their formation. The methods of natural mineral water classification are based on their distribution by types, groups and classes in composition, the presence of specific chemical substances and elements, natural gas, temperature, mineralized and physiological effects on body. The mathematical model is worked out in this article on the base of set theory and differential equations connecting a certain water type with ionic composition and mineralization. According to the given model, Eurasian mineral waters can be located in a successive change of the mole fractions relationship forming their anions (chloride, sulphate, hydrocarbonate), the indicators which possesses discrete deterministic values that determinate a type, a group and classes of mineral waters. This article shows the results of biochemical studies of the composition and properties of patients’ venous blood before and after treatment using hydromineral resources of Lake Techirghiol (Romania). The computer data processing method proposed by the authors will allow to pursue the processing of primary laboratory biochemical blood studies, to get the original mathematical model of blood composition and properties, and using 3D technology to design a physical (visual) accurate model of physiological changes and properties of patient’s blood, to plan a forthcoming treatment and to develop medical technology for patient`s rehabilitation in future. Ionic composition, the indicator of acidbase status, hemoglobin, glucose, oxygen and carbon dioxide were used as the primary blood biochemical parameters. Studies have shown: 1. The given mathematical model allows along with the classification of known mineral waters to identify newly discovered sources of natural waters in compliance with reference waters and can be recommended to the organization of the monitoring system of developed fields and quality control offered for sales of bottled mineral waters. 2. The chemical composition of patient`s blood before spa treatment is identical to natural mineral hydrocarbon-chloride waters. 3. Effect of hydromineral resources on human reduces hydrocarbon ions content and increases chloride ions in patient`s blood. 4. After treatment blood values are moved to higher alkalinity values and reducing carbon dioxide and glucose. 5. Blood oxygen saturation and hemoglobin content increase after treatment.