The polarization distribution in crystals of deuterated triglycine sulphate in a constant temperature gradient is investigated on the basis of the dynamic method for studying the pyroelectric effect. It is shown that, under equilibrium thermal conditions, the polarization distribution is uniform except for the surface layer ∼20-μm-thick. The nonuniform polarization distribution in this layer may indicate its multidomain state. In a steady-state temperature gradient, the layer thickens and its domains grow into the sample bulk.