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The absorption, stimulated emission cross section and potential laser parameters of heavy metal silicate glasses doped with Ybs+ ions have been investigated. The emission cross section has been evaluated by using the measured absorption spectra and principle of reciprocity. It is found that Yb3+ in SiO2-Bi2O3-B2O3 glass has high stimulated emission cross section of 0. Gpm2 for the 2F5/2 → 2F7/2 transition and exists short measured fluorescence lifetime of 0. 78 ms. On the other hand, the stimulated emission cross section of Yb3+-doped SiO2PbO glass was 0.49pm2. Its measured fluorescence lifetime was 2.00ms. Evaluated from the good potential laser parameters, Yb3+-doped SiO2-PbO glass may be a good candidate for fibre laser applications.