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In this investigation, the changes of magnetic properties with thermal ageing of Fe3Ni alloy have been measured. The changes in coercivity and Barkhausen noise were measured, and the results have been interpreted as magnetic ordering, based on the neuron diffraction results. The Fe3Ni alloy forms ordered superstructures, and the investigation gives the information concerning the effect of atomic ordering on the magnetic structure. The neutron diffraction results shows that the superlattice peaks correspond to a simple cubic lattice, and the intensity increases with increasing ageing time. In the ordered state, the intensity of super lattice shows inverse trends with (1 1 1) fcc peak, which means that disordered states transformed to ordered states with thermal ageing.