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The isothermal section of the phase diagram of the Dy-Er-Co ternary system at 773 K was investigated by X-ray powder diffraction (XRD), differential thermal analysis (DTA) and optical microscopy. The result shows that this section consists of 9 single-phase regions and 8 two-phase regions, and no three-phase region. The compounds Dy Co form a continuous series of solid solutions. In addition, the single phases Dy and Er also form a continuous series of solid solution. The binary compounds DyCo 5 and ErCo 5 were not observed at 773 K. No ternary compound was found.