An oxidation behavior of 304 and 316 stainless steels were studied in dry air. After solution treatment, specimens were polished up to 1㎛ A1₂O₃ grade and then subjected to oxidation treatment in dry air at 800℃∼1200℃. The oxidation behavior between matrix and oxide scale was analyzed with SEM, EDS and XRD. When oxidation treatment was conducted at 1200℃, large thickness of Fe oxide scale was formed on top of surface and fine (Cr,Fe)₂O₃oxide film was formed below it. Cr rich zone existed at interface between metal and (Cr,Fe)₂O₃oxide layer, and it was believed that this zone acted as obstacle to oxidation. Most of Ni was detected at the interface between metal and (Cr,Fe)₂O₃and also detected at the interface between Fe₂O₃and (Cr,Fe)₂O₃.