The isothermal section of the phase diagram of the Ni-Re-Ta ternary system at 1,473K was determined by means of diffu sion triple and Electron Microprobe Analysis(EMPA) technique. Five intermetallic layers were found at this temperature, which corresponding to Ni3Ta, Ni2Ta, NiTa, NiTa2 and chi phases, respectively. No ternary compound was observed.