The mixing enthalpy AH m of the liquid system Ni-Zr was measured in the Nirich range at 1916 K up to .Xzr = 0.34 at % and for the first time in the Zr-rich range at 2270 K up to -X' Ni = 0.54 at %. Using the thermodynamic-dapted power series, a composition-and temperature-dependent description of AH m was given. Furthermore, the partial differentiation of AHm(x, T) by T yielded the excess heat capacity CpX~(x, T). The existence of chemical short-range order (associate) in the vicinity of Ni7Zr2 and NiZr was shown and was discussed with reference to AHm(x, T) and CpX~(x, T) ( 1748 to 2270 K). With decreasing temperature, the influence of chemical short-range order tended toward the composition NiZr.