Domain-wall-pinning　is　one　of　the　ways　to　realize　magnetic　hardening　for　permanent　magnet　materials.　The　sintered　2:17　Sm-Co　magnets,　a　most　typical　pinning-controlled　magnet,　have　complex　nano-scaled　cellular　structures　including　cellular　matrix　phase,　cell　wall　phase,　and　lamellar　Zr-rich　phase.　In　this　paper,　a　multiple　domain-wall-pinning　with　cell　wall　phase　dominating　and　Zr-rich　phase　participating　was　proposed　through　micromagnetic　simulation.　The　simulation　results　were　supported　by　magnetic　domain　observation　and　macroscopic　magnetic　measurement　analysis,　which　provided　a　key　reference　for　the　correlation　between　the　magnetic　properties　and　microstructure　of　this　kind　of　magnet.　Furthermore,　the　squareness　of　the　demagneti-zation　curve　for　the　magnet　was　affected　by　multiple　pinning,　including　multiple　pinning　phases　and　the　internal　inhomogeneity　inside　a　pinning　phase.　Our　finding　can　enrich　the　magnetic　hardening　mechanism　and　provide　theoretical　guidance　for　the　optimization　of　magnetic　properties　of　the　pinning-controlled　permanent　magnets.