The lattice constants,cell volumes and Mechanical properties of Mg2Ni alloy at different pressures were calculated and analyzed by the first-principles investigations.It was shown that lattice parameters and volume of Mg2Ni decreased gradually with increased pressures in the range of 0～60 GPa,and the elastic con-stant C11,C12,C13,C33 and C44 of Mg2Ni satisfied the stability criterion at 0～35 GPa pressure.The stability cri-terion was not satisfied at the pressure of 40～60 GPa,which suggest mechanical instability.The bulk modu-lus B,Young's modulus Y and shear modulus G of Mg2Ni all increased with the increase of pressure,which meant good mechanical properties in high pressure environment.The Cauchy pressure,G/B and Poisson's ra-tio of Mg2Ni showed that Mg2Ni exhibited brittleness at pressure of 0～5 GPa and ductility at pressure of 7～35 GPa.
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