The structural and physical properties for xSrO-(100-x)P2O5 glasses, with x = 30, 35, 40, 45, and 50, were investigated. The amorphous state of samples was verified by X-ray diffraction (XRD). Substitution of P2O5 for SrO in the binary SrO-P2O5 glass decreases the molar volume and increase the density measurements from 1.98 to 4.01 g/cm(3). The Infra-Red (IR) and Raman spectra allow us to identify the network modifier role of Sr2+ ions and the structural network of these phosphate glasses which consists of branching (Q(3)), middle phosphate tetrahedra (Q(2)) and pyrophosphate (Q(1)).