The surface structure of polycrystalline wustite was observed by means of scanning tunnel microscopy (STM). Wustite (Fe1-xO) samples were prepared from oxidation of iron plates under different oxygen partial pressures. The non-stoichiometry numbers (1-x) of Fe1-xO were 0.912, 0.901 and 0.887, respectively. Fe1-xO surface is composed of many terraces like stairs. The planes are covered with mesh. The mesh size is about 1.3?nm, corresponding to the double lattice constant of Fe1-xO, and independent of x. There are some depressions in the mesh randomly distributed and the mesh around the depressions is deformed.
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