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The isothermal section of the Ni-Mn-Sb ternary system at 773 K was measured by means of 117 alloys which were analyzed by using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), and electron probe microanalysis (EPMA) techniques. The existence of 7 binary compounds, namely NiMn, Mn 2 Sb, MnSb, NiSb 2 , NiSb, Ni 5 Sb 2 , Ni 3 Sb and 2 ternary compounds, namely Ni 2 MnSb and NiMnSb were confirmed for this isothermal section. The four binary compounds Ni 3 Sb (Cu 3 Ti structure, Pmmn space group), Ni 5 Sb 2 (Ni 5 Sb 2-type structure, C2 space group), NiSb 2 (FeS 2-type structure, Pnnm space group) and Mn 2 Sb (Cu 2 Sb-type structure, P4/nmm space group) in the binary systems Ni-Sb and Mn-Sb were stoichiometric compounds, the homogeneity ranges of which were negligible. However the five single phases in the Ni-Mn system and the two binary compounds MnSb and NiSb showed more or less homogeneity ranges formed by substitution of Mn and Sb for Ni atom. The Heusler compound μ (Ni 2 MnSb) has L21-type ordered structure with space group Fm-3m, a = 0.6017 nm. And the crystal structure for the Half-Heusler compound κ (NiMnSb) is C1b-type (F-43m) with a = 0.5961 nm. The approximate homogeneity ranges of the two ternary compounds μ and κ at 773 K were investigated.