Q235　steel,　pure　copper　and　H62　brass　with　different　stacking　fault　energy　(SFE)　were　deformed　by　using　constrained　groove　pressing　(CGP).　The　effects　of　constrained　groove　pressing　on　microstructure　and　mechanical　properties　of　the　materials　were　studied.　The　results　show　that　constrained　groove　pressing　is　an　effective　way　in　refining　the　grain　size　of　the　materials,　with　the　decreasing　of　SFE,　the　grain　refinement　rate　increases.　The　hardness　of　the　materials　increases　with　the　increasing　of　CGP　passes,　and　the　amplitude　of　increasing　hardness　of　H62　brass　with　low　SFE　is　higher　than　that　of　pure　copper　and　Q235　steel　with　medium-high　SFE.　The　grain　refinement　of　pure　copper　and　Q235　steel　with　medium-high　SFE　is　caused　by　dislocation　slip,　and　H62　brass　with　low　SFE　is　caused　by　dislocation　slip　and　twinning　during　constrained　groove　pressing.