Dielectric properties of a D-serine admixtured triglycine sulphate (TGS) crystal were studied on samples cut out from different sites in the crystal.The value of spontaneous polarization P3 measured on b-cuts was found to be independent of the site. Whereas the coercive field EE values were higher for the samples cut out closer to the seed than for those cut out at the ends of the crystal along b axis. After rejuvenation the values of the bias field Eb increased in contrary to the effect observed in the pure TGS crystals.An exponentially decreasing dependence of the maximum permittivity ε m a x on the site of the samples (b-plates) cut out along b axis from -b to +b positions, was obtained.