In order to explore the damping characteristics of the embedded co-cured damping composite circular plate structure,based on the first-order shear deformation theory,the strain energy and kinetic energy of the damping composite circular plate structure were calculated,and the theoretical model of the damped circular plate structure was established by the Rayleigh-Ritz method under the condition of the four-side clamped boundary.The damping circular plate structural specimens were made and the experimental platform was built.The theoretical solution,numerical simulation solution and modal experimental solution were compared to prove the validity of the theoretical model.At the same time,the effect of damping layer parameters on the natural frequency and loss factor of the structure was further analyzed.The results show that when the ratio of the damping layer reaches a certain value,the loss factor has a peak value;under the condition of a certain radius,the stiffness and damping performance of the structure can be significantly enhanced by taking the thickness of the damping layer in an appropriate proportion to the radius;the thickness of the composite material layer and the damping layer ratio exists the optimal value of the structure design.