Considering　the　contact　rigidity　of　each　contact　surface　from　ball　screw　feed　drives,　a　finite　element　(FE)　modeling　method　was　proposed.　The　screw　nut,　the　linear　guide,　and　the　bearing　were　modeled　by　mass-spring　systems.　The　contact　rigidity　was　precisely　calculated　based　on　the　Hertz　contact　theory.　A　dynamic　model　of　the　ball　screw　feed　drive　was　established　with　an　improved　meshing　scheme　in　ANSYS.　The　first-five　vibration　modes　and　natural　frequencies　were　acquired.　The　modal　experiment　was　conducted　using　hammer　impact　excitation.　It　is　found　that　the　simulated　results　correspond　closely　with　the　experimental　data　and　the　maximal　error　of　the　natural　frequency　is　8.9%.　Based　on　the　established　model,　the　influences　of　the　spindle　quality,　the　linear　guide　preload,　and　the　block　interval　were　investigated.　The　work　contributes　to　the　vibration　analysis　and　structure　optimization　of　ball　screw　feed　drives.　©　2019,　Editorial　Office　of　Journal　of　Vibration　and　Shock.　All　right　reserved.