Abstract: In order to improve the dynamics property of composite structures significantly, a new co-cured composite structure with multilayer damping membranes embedded was proposed firstly, and the specimens of the embedded medium-temperature co-cured multilayer damping membranes composites were manufactured according to the curing process curves of glass fiber/epoxy (5231/EW180B) prepreg. Then, the finite element numerical simulation method based on modal strain energy was explored to investigate the dynamics property of the structure. Finally, the results were compared with the experimental data of modal analysis, and the variation relationships of modal parameters of co-cured composite structure with multilayer damping membranes embedded versus the thickness, number, location and distribution of damping layers were obtained. The results indicate that the composite structure with multilayer damping membranes embedded can enhance the first order modal loss factor of whole structure greatly. The research results lay the foundation of the further investigation of designing theory and manufacturing technology of composite structure with lightweight and high damping.