This　paper　investigates　the　effect　of　a　gear　tooth　peeling　on　meshing　stiffness　of　involute　gears.　The　tooth　of　the　gear　wheel　is　symmetric　about　the　axis,　and　its　symmetry　will　change　after　the　gear　spalling,　and　its　meshing　stiffness　will　also　change　during　the　meshing　process.　On　this　basis,　an　analytical　model　was　developed,　and　based　on　the　energy　method　a　meshing　stiffness　algorithm　for　the　complete　meshing　process　of　single　gear　teeth　with　peeling　gears　was　proposed.　According　to　the　influence　of　the　change　of　meshing　point　relative　to　the　peeling　position　on　the　meshing　stiffness,　this　algorithm　calculates　its　stiffness　separately.　The　influence　of　the　peeling　sizes　on　mesh　stiffness　is　studied　by　simulation　analysis.　As　a　very　important　parameter,　the　study　of　gear　mesh　stiffness　is　of　great　significance　to　the　monitoring　of　working　conditions　and　the　prevention　of　sudden　failure　of　the　gear　box　system.