Microscratch　tests　were　carried　out　on　polyamide　(PA)　and　polypropylene　(PP)　by　Berkovich　indenter　to　study　influence　of　sliding　velocity　on　microscratch　response　of　carbohydrate　polymers.　Both　penetration　depth　and　residual　depth　decrease　nonlinearly　with　the　increase　of　sliding　velocity.　Elastic　deformation　is　dominant　in　the　total　deformation　during　scratching　of　polymers.　Both　residual　and　contact　scratch　widths　decrease　nonlinearly　with　sliding　velocity.　The　elastic　recovery　rate　increases　with　sliding　velocity.　Both　scratch　hardness　and　lateral　hardness　increase　nonlinearly　with　sliding　velocity.　Scratch　hardness　also　increases　nonlinearly　with　the　increase　of　strain　rate　due　to　strain　rate　hardening　effect.　Scratch　friction　coefficient　of　PA　decreases　with　increasing　sliding　velocities,　and　can　be　regarded　to　be　constant　under　large　sliding　velocities.　Nevertheless,　scratch　friction　coefficient　of　PP　increases　with　sliding　velocity.　Residual　scratch　grooves,　scratch　friction　coefficient,　and　lateral　force　under　different　sliding　velocities　can　be　used　to　reveal　the　different　friction　mechanisms　of　PA　and　PP.