The influence of mechanoactivation in a planetary ball mill of the initial mixtures of the B2O3-SiO2-Na2O glasses on their thermal stability has been studied. It was concluded the growth of duration of pretreatment of an initial charge for glass preparation in planetary-type mill FRITSCH from 1 hour up to 6 hours yields a positive effect. Correlation between mechanoactivation and thermoanalysis data, density, surface tension, viscosity and conductivity, IR spectra is considered.