The　effects　of　dynamic　strain-aging　and　deformation　twinning　on　the　tensile　properties　of　a　low　stacking　fault　energy　fcc　alloy,　brass　H68　(Cu-32wt-%Zn),　were　investigated.　The　experiments　were　carried　out　at　196　to　623　K　with　a　strain　rate　of　4.　9　multiplied　by　10**　minus　**4　s**　minus　**1.　The　average　grain　size　is　0.　05mm.　The　results　showed　that　under　different　temperatures　the　maximum　uniform　strain,　the　reduction　of　area　and　the　twinned　volume　fraction　of　this　alloy　all　increased　with　a　decreasing　temperature　in　a　similar　manner.　It　was　also　found　that　there　is　an　evident　work-hardening　peak　of　this　material　in　a　certain　temperature　region.　Moreover,　the　effects　of　deformation　twinning　on　mechanical　properties　extend　to　about　100　degrees　above　room　temperature,　and　an　overlap　of　the　influences　of　deformation　twinning　and　dynamic　strain-aging　was　obtained.　It　is　believed　that　the　change　of　mechanical　properties　from　333　to　400　K　is　caused　by　the　combined　influence　of　those　two　factors.