We have studied the temperature dependent magnetic properties and crystalline phase transitionn in small amount Fe doped nickel chromite. The Crystalline structure of NiCr_1.7Fe_0.3O₄ is spinel cubic (Fd-3m) structure with a lattice constant a₀=8.317Å at room temperature. The magnetic N'eeltemperature (T_N)of the Fe doped nickel chromite sample is determined to be 250 K. The Mëssbauer spectra exhibit that there are two magnetic phases with the two different sites for the Cr³⁺ions. The spectrum at 4.2 K is fitted to two magnetic components of the magnetic hyperfine fields H_hl=496 and 485 kOe. From the spectrum at 295 K, the electric quadrupole splittings are observed with large values of 0.49 and 0.50 mm/s, respectively. The values of the isomer shifts at all temperature ranges show that the Fe ions are ferric states. We are suggested that the dynamic Jahn-Teller distortion and anisotropic magnetic relaxation effects due to the crystalline phase transition.