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Phase equilibria in the Oy-Fe-Cr system were investigated by X-ray powder diffraction(XRD)，differential thermal analysis(DTA),scanning electron microscopy(SEM)techniques and the isothermal section at 773 K was obtained．It consists of 8 single·phase regions,14 two-phase regions and 7 three-phase regions．The existence of the compound DyFe12-xCrx(1.6≤x≤3.0，space group 14/mmm)with ThMn12-type structure was confirmed．The maximum solid solubility of Cr in Fe，Dy2Fe17，Dy6Fe23，DyFe3 and DyFe2 is about 15 at．％13at．％ 6 at．％，5 at．％ and 16 at．％ respectively．