The overview discusses dielectric relaxation in polymer electrolytes as a function of salt content.Impedance is seen as key quantity which images relaxation properties of those systems, It follows Debye relaxation at low salt concentration.With increasing salt content one observes dispersion of relaxation time.The spectrum of imaginary part of impedance displays two extreme values: maximum and minimum.The maximum reflects chain relaxation.It shifts with increasing salt content to higher frequencies, which is consistent with increase in glass transition temperature under the same conditions.The minimum characterizes electrode polarization or formation of double layer at the electrode/electrolyte interface.The frequency where the minimum occurs might be seen as diffusion frequency.It governs transport of charge carriers in the limit of low frequencies.Consequently, diffusion coefficient (Dion) changes as frequency ωmin in dependence on salt content.