The　evolution　of　microstructure　of　CoCrFeMnNi　high-entropy　alloy　during　quasi-static　tensile　(strain　rate　1×10-1　s-1)　were　investigated　using　electron　backscatter　diffraction　technology.　The　results　show　that　the　dominant　deformation　mechanism　is　dislocation　gliding,　which　is　accompanied　with　less　twinning.　The　alloy　generates　new　Σ3　twin　boundaries　when　the　strains　is　0.81%.　The　tensile　axes　close　to　<001>　rotate　toward　<001>　and　form　a　weak　<001>//RD　fiber　texture　following　Toylor　model.　The　tensile　axes　rotate　to　the　line　of　<001>-<111>　following　Sachs　model,　the　grain　size　influences　the　rotational　speed　of　grains.　The　rotational　speed　of　small　grain　is　the　fastest　than　big　grains　and　medium　grains,　and　the　medium　grain　is　the　slowest　than　other　grains.　The　bigger　Schmid　factor　of　grain　is,　the　faster　grain　rotation　is.　©　2018,　Science　Press.　All　right　reserved.