Fe-57 Mossbauer effect studies were carried out on the quasibinary Ni3Fe1-xSix alloy system for x =, 0, 0.1, 0.25, 0.5, 0.75 and 0.9 compositions. Single phase alloys are formed upto x = 0.5 whereas a two phase alloy is observed for x = 0.75 composition. The x = 0.9 composition also shows single phase formation with lattice parameters close to Ni3Si. Substitution of Si primarily takes place at the Fe sites and the x = 0.25 composition shows a high degree of L1(2) order. The magnetic hyperfine field systematics are discussed in terms of first and second neighbour configurations.