In　this　article,　the　Sm2Co7/alpha-Fe　nanocomposite　magnets　were　prepared　by　high　energy　ball　milling　and　spark　plasma　sintering　method.　The　effect　of　soft　phase　content　on　the　magnetic　properties　was　studied.　Up　to　30　wt%　alpha-Fe　was　added　into　Sm2Co7　matrix　without　the　decrease　of　remanence.　Optimal　energy　product　(BH)(max)　of　9.2MGOe　was　obtained　with　20　wt%　alpha-Fe.　TEM　observation　shows　that　the　grain　size　of　alpha-Fe　is　20-50　nm　which　ensures　a　good　coupling　effect　between　soft　and　hard　phase.　One　more　thing　needs　to　be　mentioned　is　that　there　exists　inter-diffusion　between　Sm-Co　phase　and　alpha-Fe　phase.　Moreover,　our　results　can　also　illustrate　that　the　Sm2Co7/alpha-Fe　nanocomposite　magnets　are　able　to　acquire　better　magnetic　properties　than　the　SmCo5/alpha-Fe　magnets　prepared　by　the　same　process　due　to　the　large　domain　width　of　Sm2Co7　phase.　(C)　2020　Chinese　Society　of　Rare　Earths.　Published　by　Elsevier　B.V.　All　rights　reserved.