CaSO4　whisker　reinforced　resin-based　composite　friction　materials　(sample　A)　were　prepared　by　thermo-compression　process,　and　a　commercial　brake　material　(sample　B)　was　selected　as　a　reference.　The　influence　of　braking　frequency　on　the　tribological　performance　of　samples　was　investigated　by　CHASE　tester.　The　SEM　and　EDAX　were　used　to　observe　the　wear　surface　morphology　and　the　composition　of　the　surface　of　films　respectively,　and　the　influence　mechanism　of　braking　frequency　on　wear　mechanism　of　samples　was　analyzed.　The　results　show　that　CaSO4　whisker　has　played　a　significant　toughening　and　strengthening　effects　on　sample　A,　the　average　friction　coefficient　of　sample　A　always　maintains　at　a　high　level　of　around　0.48　and　exhibits　stable　and　reliable　braking　performance　with　the　change　of　braking　frequency.　Moreover,　the　damage　degree　of　dual　disc　is　lighter,　and　the　main　wear　mechanism　is　abrasive　wear.　While　the　friction　coefficient　of　sample　B　decreases　firstly　and　then　increases,　and　shows　sensitive　to　the　change　of　braking　velocity,　as　well　as　its　main　wear　mechanism　is　adhesive　wear　and　oxidation　wear.　The　friction　surface　temperature　and　mass　wear　rate　of　samples　are　increased　with　increasing　of　braking　frequency,　but　both　materials　show　good　wear　resistance　when　the　braking　frequency　less　than　35　times.　©　2016,　Beijing　Institute　of　Aeronautical　Materials　(BIAM).　All　right　reserved.