The　gear　drive　is　theoretically　a　normal-order　meshing　process　to　transmit　movement　and　power.　When　temperature　variation,　misalignment,　manufacture　error,　or　deformation　occurs,　the　normalorder　meshing　will　be　destroyed.　Under　certain　conditions,　the　contact　point　moves　in　the　opposite　direction　to　the　normal　order　on　the　surface　of　the　tooth.　This　process　is　called　gear　reverse-order　meshing.　The　gear　reverse-order　meshing　will　lead　to　gear　impact　and　generate　noise　during　the　transmission.　In　the　study,　with　gear　pairs　with　base　pitch　deviation　as　the　study　object,　we　further　studied　this　process　and　expanded　the　application　scope　of　the　process　to　kinematics　and　dynamics.　The　transmission　error　of　the　gear　reverse-order　meshing　process　was　deduced.　Both　the　speed　error　and　acceleration　error　were　obtained.　Based　on　the　curves　of　these　three　variables,　the　influence　of　gear　reverse-order　meshing　on　gear　transmission　characteristic　was　analyzed　to　explore　the　causes　for　the　meshing　impact　phenomenon.　Although　the　gear　reverse-order　meshing　process　has　some　disadvantages,　it　could　also　be　applied　in　some　fields.　Due　to　the　feature　of　gear　reverse-order　meshing,　it　is　applied　to　gear　integrated　error　(GIE)　measuring　technique　and　tooth-skipped　gear　honing　process　effectively.