The　effects　of　different　annealing　temperature　and　time　on　the　microstructural　evolution　and　mechanical　properties　of　the　oxygen　free　copper　tube　were　investigated　by　OM,　TEM,　SEM　and　universal　tensile　tester.　The　results　reveal　that:　the　high　energy　and　high　density　dislocation　of　the　as-deformed　sample　are　evolved　into　thin　dislocation　walls,　subgrain　boundaries　and　then　high　angle　grain　boundaries　with　annealing　at　260℃　or　300℃　for　60min,　resulting　in　low　density　dislocation　structure.　After　annealing　at　300℃,　recovery　and　recrystallization　are　fully　completed.　The　tensile　strength,　yield　strength　and　hardness　are　decreased　with　temperature　increase,　while　the　elongation　is　increased.　Within　the　annealing　temperature　range　of　300℃　to　460℃,　the　change　of　mechanical　properties　of　the　copper　tube　can　be　ignored.　Increasing　the　annealing　time　at　300℃　from　10min　to　60min,　recrystallization　is　induced　gradually,　and　the　tensile　strength,　yield　strength　and　hardness　are　decreased,　while　elongation　is　increased.　With　annealing　for　60min,　recrystallization　is　finished,　and　the　tensile　fracture　morphology　is　changed　from　quasi-cleavage　surface,　tearing　edge　and　dimple　characteristics　to　equiaxial　dimples.　Compared　with　those　of　as-deformed　sample,　the　tensile　strength,　yield　strength　and　hardness　of　the　copper　tube　are　decreased　by　39%,　68.5%　and　53.1%,　respectively,　and　the　elongation　is　increased　from　1.2%　to　50%.　With　annealing　time　more　than　60min,　the　grain　size　is　increased　slightly　before　reached　a　stable　value,　showing　an　insignificant　effect　on　the　mechanical　properties.　©　2018,　Journal　Office　of　Special　Casting　and　Nonferrous　Alloys.　All　right　reserved.