Due　to　the　merits　of　high　stiffness,　quick　dynamic　response　and　flexible　posture　adjustment,　5-axis　hybrid　machine　units　have　been　regarded　as　an　alternative　solution　for　high-efficiency　machining　of　aluminum　alloy　structural　components　with　complex　geometries.　Post-processing　is　of　great　importance　to　the　improvement　of　machine　capacity　of　hybrid　machine　units.　A　post-processing　algorithm　is　proposed　to　improve　the　surface　quality　of　the　workpieces　for　a　novel　hybrid　kinematic　machining　unit.　Firstly,　by　adopting　the　B-spline　curve,　a　double　parameter　curve　interpolation　algorithm　is　formulated　to　smooth　the　tool　tip　and　tool　axis　trajectory.　And　then,　the　parameter　synchronization　is　used　to　ensure　the　synchronous　interpolation　of　tool　tip　and　tool　axis.　Secondly,　the　velocity　mapping　model　of　the　hybrid　kinematic　machining　unit　is　formulated　and　a　velocity　allocation　algorithm　is　proposed　to　ensure　the　stability　of　tool　tip　velocity.　Thirdly,　by　using　the　inverse　kinematics　and　the　velocity　allocation　algorithm,　the　feedrate,　the　tool　tips　and　the　tool　axis　vectors　are　converted　into　a　set　of　motion　control　points　of　the　servo　motors.　Based　on　this,　the　post-processing　of　tool-path　is　realized　for　the　hybrid　kinematic　machining　unit.　Finally,　based　on　a　laboratory　prototype　of　the　hybrid　kinematic　machining　unit,　a　set　of　machining　tests　on　S-shape　workpiece　is　carried　out　to　verify　the　effectiveness　of　the　proposed　post-processing　algorithm.　©　2023　Editorial　Office　of　Chinese　Journal　of　Mechanical　Engineering.　All　rights　reserved.