Nano-iron　particles,　prepared　by　using　sonochemical　treatment　to　decompose　carbonyl　iron,　were　heterogeneously　precipitated　to　produce　Nd2Fe14　B/Fe　nanocomposite　powder.　The　composite　powders　were　sintered　in　bulk　magnets　by　spark　plasma　sintering　(SPS).　It　was　found　experimentally　that　both　the　maximum　magnetic　energy　product　and　remanence　of　Nd2Fe14B/α-Fe　magnets　increased　with　increasing　of　the　nominal　content　of　soft　magnetic　phase.　A　result　of　(BH)m=128.2　kJ·m-3　(16.1MGOe),　Br=0.92　T,　Hcj=607.35　kA·m-1　was　obtained　when　the　nominal　content　of　the　soft　magnetic　phase　was　15%.　When　the　nominal　content　was　higher　than　15%,　the　magnetic　properties　of　the　composite　declined　slightly　because　of　the　degradation　of　coercivity.