A　study　on　the　dynamic　characteristics　of　non-orthogonal　helical　face　gears　with　higher-order　tooth　surface　modification　is　presented　in　this　article.　The　method　of　designing　the　non-orthogonal　helical　face　gears　with　higher-order　tooth　surface　modification　is　described.　First,　MATLAB　programming　that　can　be　used　for　the　parameterized　3D　mesh　calculations　of　non-orthogonal　helical　face　gears　with　higher-order　tooth　surface　modification　are　completed.　Second,　the　calculated　grid　nodes　from　the　MATLAB　programming　are　imported　into　ABAQUS　to　generate　a　three-dimensional　mode.　The　meshing　stiffness　of　the　gear　pair　is　then　estimated　using　finite　element　analysis.　Ultimately,　a　dynamic　model　of　a　non-orthogonal　helical　face　gear　pair　involving　second-order　and　higher-order　tooth　surface　modifications　is　established.　One　example　is　presented　to　study　the　dynamic　characteristics　of　non-orthogonal　helical　face　gear　pairs　with　second-order　and　higher-order　tooth　surface　modifications.　The　results　show　that　the　dynamic　response　from　the　second-order　tooth　surface　modification　has　a　higher　peak-to-peak　amplitude　than　that　of　the　higher-order　modification.　©　2024　by　the　authors.