The structural and magnetic properties of nanostructued $Fe-20;wt.\%Si$ alloy powders were investigated. Commercial $Fe-20;wt.\%Si$ alloy powders (Hoeganaes Co., USA) with $99.9\%$ purities were used to fabricate the nanostructure Fe-Si alloy powders through a high-energy ball milling process. The alloy powders were fabricated at 400 rpm for 50 h, resulting in an average grain size of 16 nm. The nanostructured powder was characterized by fcc $Fe_{3}Si$ and hcp $Fe_{5}Si_3$ phases and exhibited a minimum coercivity of approximately 50 Oe.