Three Fe2O3 containing alkali-silicate glass systems in which the connection of glass uetwork are different each other are studied by means of M?ssbauer spectro-scopy. It is observed that Fe3+ ions in the glasses have a stronger coagulation effect in comparison with oxygen ions. There are two manifestations of the effect, i.e., the inter-polarization of Fet3+ in tetrahedra and the outer-polarization of Fe03+ in octahedra to the glass hetwork.