In order to improve magnetostrictive properties of the polycrystalline Fe-Ga alloys, the rare earth elements Ce, Tb and Dy were doped into Fe-Ga alloys. The microstructures and magnetostrictions of Fe83Ga17 and Fe83Ga17R0.6 ( R=Ce, Tb and Dy ) alloys were studied. The results indicated that Fe83Ga17 alloy consists of a single Fe(Ga) solid solution phase with bcc structure. However, the Fe83Ga17R0.6 ( R=Ce, Tb and Dy ) alloys are composed of the Fe(Ga) solid solution phase and a small amount of R2Fe17 secondary phase. The magnetostriction coefficients of the Fe83Ga17R0.6 ( R=Ce, Tb and Dy ) alloys are significantly larger than that of the Fe83Ga17 alloy. The improvement degree of magnetostrictive properties of Fe-Ga alloy varies with different rare earth elements doping into the alloy. The magnetostriction coefficient of Fe83Ga17Ce0.6 alloy (206×10-6) is larger than that of the Fe83Ga17Tb0.6 (165×10-6) and Fe83Ga17Dy0.6 (161×10-6) at the magnetic field of 557 kA/m.