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The structural and magnetic properties of Pr0.1CexTb0.9-x Fe1.9 alloys were investigated by using X-ray diffraction, AC susceptibility, VSM and standard strain gauge techniques. The lattice parameter exhibits positive deviation from Vegards law with the increasing Ce content in the range of 0.4 - 0.6. Curie temperature decreases linearly with increasing Ce content. The saturation magnetization and magnetostriction decrease when 0.2≤x＜0.4 and x＞0. 6, while abnormally increase with Ce content increasing from 0.4 to 0. 6. These abnormal changes of lattice parameter, saturation magnetization and magnetostriction can be attributed to the valence fluctuation of Ceions.