Despite　the　high　theoretical　energy　product　and　low　material　cost　of　Fe　-rich　2:17　-type　Sm-Co-Fe-CuZr　magnets,　it　is　still　a　big　challenge　to　simultaneously　achieve　high　energy　product　and　high　coercivity　due　to　damaged　cellular　nanostructure,　i.e.　insufficient　cell　boundary　precipitates.　In　this　work,　both　high　energy　product　(　-30.29　MGOe)　and　high　coercivity　(　-26.24　kOe)　have　been　achieved　in　Fe　-rich　Sm　24.8　Co　bal　Fe　20.5　Cu　5.2　Zr　x　(　x　wt%)　magnets　through　optimizing　Zr　content.　It　reveals　that　raising　Zr　content　from　1.5　wt%　to　2.5　wt%　can　effectively　refine　the　cellular　nanostructure,　which　corresponds　to　an　increased　volume　fraction　of　cell　boundary　precipitates.　However,　excess　Zr　content　(e.g.　above　2.5　wt%)　leads　to　the　formation　of　micron　-sized　Zr-rich　Zr　6　Co　23　soft　magnetic　particles,　weakening　the　hard　magnetic　performance.　In　particular,　the　high　Zr-content　(3.5　wt%)　magnet　exhibits　strongly　inhomogeneous　chemistry　as　well　as　cellular　nanostructure　in　the　vicinity　of　micron　-sized　Zr　6　Co　23　particles　(i.e.　heterogeneous　distribution　of　cell　boundary　precipitates),　deteriorating　both　squareness　factor　and　coercivity.　As　a　result,　the　optimum　magnetic　property　combination　is　achieved　at　an　intermediate　Zr　concentration　by　balancing　the　contradictive　effects　between　cell　refinement　and　soft　magnetic　impurities.　(c)　2024　Published　by　Elsevier　Ltd　on　behalf　of　The　editorial　office　of　Journal　of　Materials　Science　&　Technology.