The calculation method of loaded gear mesh stiffness is proposed based on the finite element method(FEM).The time-varying mesh stiffness based on this method and ISO6336-1:2006standard is compared
the correctness and accuracy of the presented calculation method of loaded time-varying gear mesh stiffness is verified.The calculation method of determining the quantitative relation between contact ratio and load is given.The results of cylindrical gear numerical calculation show that the gear mesh stiffness
gear contact ratio and loaded has a corresponding mapping relation.