Friction　rolling　additive　manufacturing　(FRAM)　is　a　solid-state　additive　manufacturing　method　capable　of　accommodating　a　wide　range　of　material　forms.　However,　there　is　a　lack　of　comprehensive　research　on　the　optimal　feedstock　form.　Thus,　this　study　investigated　the　influence　of　feedstock　shape　on　material　formation,　microstructure,　and　mechanical　properties.　The　results　revealed　that　irrespective　of　whether　a　strip　or　wire　was　used,　the　plasticized　material　flowed　through　a　thin　plastic　flow　channel　(approximately　112　mu　m)　between　the　tool　head　and　the　feedstock.　Wire　feedstock　resulted　in　greater　deformation　and　more　significant　grain　refinement　than　strip　feedstock,　with　grain　refinements　of　95　%　and　81　%,　respectively.　Additionally,　gaps　between　multiple　wires　were　filled　with　plasticized　material,　forming　a　dense　and　defect-free　mixing　zone.　Moreover,　the　tensile　performances　of　the　deposited　samples　obtained　from　wire　and　strip　feedstocks　exhibited　no　significant　differences,　measuring　143.9　MPa　and　144.5　MPa,　respectively.　Numerical　simulations　were　employed　to　elucidate　the　underlying　mechanism　of　the　temperature　field　and　material　flow　behavior　when　strips　and　wires　were　used　as　feed　materials.　The　findings　of　this　study　are　anticipated　to　serve　as　a　reference　for　selecting　feedstock　forms　for　FRAM.