The phase equilibrium relations of the ternary Ni-Cr-Zr system at 900℃ have been investigated by means of diffusion triple and electron probe microanalysis (EMPA) techniques. A series of tie lines and triangles have been determined, and the corresponding tentative isothermal section is presented based on the current information. The phase equilibrium relations of the ternary Ni-Cr-Zr system at 900 ° C have been investigated by means of diffusion triple and electron probe microanalysis (EMPA) techniques. A series of tie lines and triangles have been determined, and the corresponding tentative isothermal section is presented based on the current information.