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The crystal structure, phase abundance and the electrochemical properties ofZr(Mn1-xNix)2 (0.40≤x≤0.75) alloys were investigated by means of XRD, Rietveldrefinement method and electrochemical measurements. The alloys are multiphase.C15 Laves phase occurs as a main phase accompanying with C14 phase and other mi-nor phases, indicating that Ni element is C15-stabilized element for ZrMn2 alloy. Thephase abundance and lattice parameters of Laves phase are influenced significantly byNi substitution. The Zr(Mn0.45Ni0.55)2 alloy with the highest amount of C15 phaseexhibits the maximum electrochemical capacity of 242mAh/g. C14 phase occurring inZr-Mn-Ni alloys is beneficial for the electrochemical kinetics of hydride electrodes.``