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Deuterium resonance investigations of KD3(SeO3)2 single crystals are performed both in the paraelectric and ferroelastic phase. The electric quadrupole coupling constants lie between 120 and 180 kHz. The directions of the qzz-components of the EFG-tensors are in good agreement with the hydrogen bond directions determined by X-ray structure analysis and neutron scattering. There are two types of hydrogen bonds with different behavior at phase transition. The O(2)...H...O(2) bond shows an order-disorder process in contrast to the O(3)-H...O(1) bond being present below Tc in two bond lengths. The first bond turns out of the ac-plane by the monoclinic angle. The temperature dependence of the spectra is examined at a defined orientation between room temperature and -40 Cel.