Fluorescence properties of Eu³⁺ ions doped in several oxide glasses were investigated using UV excitation and laser induced FLN (fluorescence line-narrowing) techniques. Inhomogenities of the sites of Eu³⁺ were evaluated from the width of the fluorescence peak of ⁵D₀→⁷F₀ transition, Δν_IH. Borate and germanate glasses in which the network forming ions can take two kinds of the coordination number depending on the amount of these ions, showed the Δν_IH values larger than those of silicate and borophosphate glasses. On the other hand, phosphate glasses composed of chain-like units showed the small Δν_IH value. Furthermore, the splitting of ⁵D₀→⁷F₁ transition peak was investigated by using FLN technique in order to compare the sites of Eu³⁺ ions which were excited by the same laser energy. The widths of splitting in the borate, germanate and phosphate glasses varied with alkaline content, whereas those in silicate and borophosphate glasses hardly changed. Such behaviors seem to be due to the compositional dependence of the condition of non-bridging oxygens which coordinate Eu³⁺ ions. From these results, it was concluded that the environments around the Eu³⁺ -sites in the silicate and borophosphate glasses are not influenced so much by the concentration of Na₂O.