In　recent　years,　the　incidence　rate　of　lumbar　diseases　has　been　progressively　increasing.　The　conventional　lumbar　fusion　cages　used　in　existing　lumbar　interbody　fusion　surgery　are　not　able　to　take　into　account　the　multiple　characteristics　of　cushioning,　vibration　reduction,　support,　cell　adhesion,　and　bone　tissue　growth.　Therefore,　in　this　work,　based　on　the　CT　data　of　a　lumbar　intervertebral　disc　plain　scan,　a　combined　symmetric　lumbar　fusion　cage　structure　was　innovatively　designed.　The　core　was　made　of　lightweight　TC4　medical　titanium　alloy　flexible　microporous　metal　rubber　(LTA-FMP　MR),　and　the　outer　frame　was　made　of　cobalt–chromium–molybdenum　alloy.　Its　comprehensive　biomechanical　performance　was　comprehensively　evaluated　through　finite　element　simulation,　static　and　dynamic　mechanics,　and　impact　resistance　tests.　The　three-dimensional　model　of　the　L3/L4　lumbar　segment　was　established　by　reverse　engineering,　and　a　Mises　stress　analysis　was　conducted　on　the　lumbar　fusion　cage　by　importing　it　into　Ansys　to　understand　its　structural　advantages　compared　to　the　traditional　lumbar　fusion　cage.　Through　static　experiments,　the　influence　of　the　internal　nucleus　of　a　symmetrical　lumbar　fusion　cage　with　different　material　parameters　on　its　static　performance　was　explored.　At　the　same　time,　to　further　explore　the　superior　characteristics　of　this　symmetrical　structure　in　complex　human　environments,　a　biomechanical　test　platform　was　established　to　analyze　its　biomechanical　performance　under　sinusoidal　excitation　of　different　amplitudes　and　frequencies,　as　well　as　impact　loads　of　different　amplitudes　and　pulse　widths.　The　results　show　that　under　different　amplitudes　and　frequencies,　the　lumbar　fusion　cage　with　a　symmetrical　structure　has　a　small　loss　factor,　a　high　impact　isolation　coefficient,　and　a　maximum　energy　consumption　of　422.8　N·mm,　with　a　maximum　kinetic　energy　attenuation　rate　of　0.43.　Compared　to　existing　traditional　lumbar　fusion　cages　in　clinical　practice,　it　not　only　has　sufficient　stiffness,　but　also　has　good　vibration　damping,　support,　and　impact　resistance　performance,　and　has　a　lower　probability　of　postoperative　settlement,　which　has　broad　application　prospects.　©　2023　by　the　authors.