Abstract: The work summarized in this paper aims at improving the accuracy of rotor blade dynamics analysis,and that of its internal force calculation in particular,by the finite element method.A family of nonuniform rotating beam conforming elements is developed.Also,it is proposed how the internal force of the blade can be calculated directly from the node displacement by means of the dynamic stiffness matrix of the finite element（"dyna-mic stiffness method" for short）.In illustration the natural frequencies,mode shapes and bending moments of a blade flapwise bending vibration have been calculated.Numerical results are presented for a typical case.The blade has discontinuosly varying bending stiffness and mass distribution along the spanwise direction.The nonuniform rotating beam conforming elements with displacement functions based respectively on the 3rd,5th and 7th order polynomial and the "dynamic stiffness method" are used in the calculation.The results show that the work has attained the predetermi-nate goal.