Lithium diphosphate glasses doped MgO was prepared via a melt quenching technique. The samples were characterized by X-ray diffraction (XRD), Raman and impedance spectroscopy. XRD spectra reflected the amorphous nature of the glasses Raman spectra show structural network modifications with the compo- sition variations of the studied glasses. Raman spectra of the studied glasses contain also typical phos- phate glasses bands. Thus the band at � 698 cm � 1 assigned to symmetric stretching vibrations of PAOAP groups and that from � 1168 cm � 1 is attributed to symmetric stretching motions of the non-bridging oxygen (NBO) atoms bonded to phosphorous atoms (PO2) in phosphate tetrahedron. Electric properties were investigated using complex impedance spectroscopy in a frequency range from 40 Hz to 6 MHz at room temperature. The impedance spectra were analyzed in terms of equivalent cir- cuits involving resistors, capacitors and constant phase elements (CPE). Constant-phase elements (CPE) are used in equivalent electrical circuits for the fitting of experimental impedance data. The AC conduc- tivity exhibited a Jonscher's universal power law according with the relation r(x )= r(0) + Ax s and it is observed that as the MgO content increases, frequency exponent (s) decreases.