Abstract: In order to explore the influence of stiffener configurations on the intrinsic dynamic characteristics of the stiffened plates, natural frequencies and mode shapes of orthogonally, obliquely, and curvilinearly stiffened plates are calculated by the finite element method under the clamped boundary conditions. The comparative and analogy analysis on the intrinsic dynamic characteristics of the three types of stiffened plates reveals the influence of the stiffener configurations on the dynamic coupling behaviors and intrinsic dynamic characteristics of the stiffened plates. Numerical results show that the natural frequency of the obliquely stiffened plate can be increased by 9% higher than that of the orthogonally stiffened plate. The stiffness distribution of obliquely stiffened plate and curvilinearly stiffened plate is more homogeneous than that of the orthogonally stiffened plate, and the dynamic stiffness homogenization effect of curvilinearly stiffened plate is more significant. The stronger the reinforcement, the greater the influence of the stiffener configurations on the dynamic characteristics of the stiffened plate.