SEELFS mechanism was outlined and the Fourier transform function of Mg k- edge of MgO and Mg(Al)O were obtained after the data analysis of the SEELFS features. The peaks attributable to the Mg－O shell of two compounds were similar, whereas the peaks attributable to the Mg－ Mg shell varied in the intensities and positions due to the introduction of Al^3^+ at nearest-neighbour.

Key words: MAGNESIUM OXIDE, ALUMINIUM OXIDE, DOUBLE OXIDE, EXTENDED X-RAY ABSORPTION FINE STRUCTURE SPECTROSCOPY