A task of revealing the correlation between properties and structural parameters is reduced to ascertainment of coefficients which characterize a contribution of one or other structure elements into given property. The multiple regression method is used in problem solving with regard to the structure elements present in melt of given composition. The contribution of the structure elements of high-molecular compounds into their selective activity is determined to reveal the correlation dependences of structure-properties type in the polymeric melts of PbO-SiO2 and CaO-SiO2 systems.