Sm(Co,Cu,Fe,Zr)(z)　magnets　have　drawn　much　attention　for　high-temperature　applications　due　to　their　high　Curie　temperature,　strong　corrosion　resistance　and　thermal　stability.　The　effect　of　increasing　Fe　content　on　the　distribution　of　elements　and　squareness　(S-r)　of　demagnetization　curves　were　investigated　for　two　kinds　of　magnets　with　different　nominal　compositions　of　Sm(CobalFe0.15Cu0.07Zr0.03)(7.8)　and　Sm(CobalFe0.28Cu0.07Zr0.03)(6.6)　in　this　work.　The　magnetic　properties　of　the　magnets　with　higher　Fe　content　fluctuate　greatly　after　different　solution　treatments,　indicating　that　they　are　more　sensitive　to　the　process　temperature.　The　increase　in　Fe　content　can　obviously　enhance　the　cellular　phase　size.　Meanwhile,　inhomogeneous　Cu　distribution　is　observed　in　the　Sm(CobalFe0.28Cu0.07Zr0.03)(6.6)　magnet,　resulting　in　the　different　cellular　structures　and　corresponding　magnetic　domain　patterns　in　different　regions　in　the　inner　grains.　Furthermore,　the　lower　Cu　content　regions　are　responsible　for　the　wider　magnetic　domain,　which　have　weaker　resistance　to　applied　magnetic　field.　As　a　result,　S-r　of　demagnetization　curve　decreases　with　the　increase　in　Fe　content　due　to　the　inhomogeneous　Cu　distribution,　which　was　confirmed　by　in-situ　observation　of　electron　probe　micro-analyzer　(EPMA)　and　magneto-optical　Kerr　optical　microscope　(MOKE).