The　effect　of　torsional　rate　on　the　microstructure　and　texture　of　pure　Cu　at　an　equivalent　strain　of　3.94　was　investigated　by　electron　backscatter　diffraction　technique.　The　microstructure,　texture　evolutions　and　microhardness　at　different　regions　along　radial　directions　were　quantitatively　analyzed.　The　results　demonstrated　that　the　grain　size　and　microhardness　reduced　gradually　along　the　radial　direction,　showing　characteristics　of　gradient　distribution.　However,　the　torsional　rate　didn＇t　show　significant　effect　on　them.　The　texture　results　showed　that　typical　torsion　textures　developed　during　deformation.　A/-A　texture　and　B/-B　texture　were　the　major　components　in　the　center　and　1/4　layer,　and　showed　similar　changes　at　different　regions.　While　at　the　edge,　C　texture　prevailed,　and　its　strength　increased　as　the　torsional　rate　rose.　The　torsional　rate,　however,　didn＇t　show　significant　effect　on　the　texture　development　of　A/-A　and　B/-B　textures　as　well.　©　2020