Ternary oxides of sodium and plutonium in oxidation states from +4 to +7 have been obtained by solid state reactions at elevated temperatures in pure argon or oxygen atmospheres. Sodium diplutonate was formed as a decomposition product of other plutonates at room temperature. The crystal structures of these compounds have been refined by the Rietveld method using conventional X-ray powder diffraction technique. The structural analogues were found among the families of complex oxides of alkali elements and cerium, ruthenium, antimony, uranium/neptunium and osmium. The new results were compared with the earlier known data for the system Na-Pu-O. ; JRC.E.3-Materials research