Abstract:As a new type of composite folded sandwich structure, folded sandwich structure has the advantages of light weight,good mechanical properties,easy molding and wide applicability of materials.It has good prospects in the fields of lightweight industrial equipment. The structural parameters have very important influence on the mechanical properties,however, there is still little relevant research.In this study, carbon and Kevlar prepreg textile were taken as raw materials of the folded cores. The samples of composite folded sandwich structure was prepared by hot-pressing method. The force-displacement curves of folded sandwich structures under static compressive loading were obtained by compression tests under different conditions. The finite element models of the composite folded sandwich structure were constructed to carry out the numerical simulation and analysis of the mechanical properties of the composite folded sandwich structure with different structural parameters, and the simulation results were compared with the experimental results to verify the reliability of the model. The results show that the compressive strength of the folded core increases linearly with increase of the thickness of the core, and the failure form of the model is transformed from the pseudo-plastic deformation to the brittle failure. The constraint of the panel to the folded core can greatly improve the compression modulus and strength, and the upper and lower panels have different effects on the compression performance curves. The height, length, angle and other parameters of the folded sandwich cell have different effects on its mechanical properties as well.