Abstract: A deformable honeycomb structure with compliant hinge which is composed of the cross-shaped honeycomb and the half inside lamina emergent torsional joint was proposed. By reducing the in-plane stiffness, the deformation ability of the structure is improved, and it has the characteristics of light weight and low in-plane modulus. The in-plane equivalent elastic modulus of the deformable honeycomb structure was studied by theoretical analysis, and simulation and experimental verification were carried out. The influence of geometric parameters on the equivalent elastic modulus of the structure was also analyzed. The in-plane deformation ability of the deformable honeycomb with compliant hinge and the cross-shaped honeycomb was compared through simulation and experiment. The results show that the deformable honeycomb structure with compliant hinge has better in-plane deformable ability. Compared with cross-shaped honeycomb, the equivalent elastic modulus of deformable honeycomb with compliant hinge is reduced by more than 80%. Thus, the combination of compliant hinge and deformable honeycomb structure is an effective way to improve the in-plane deformation ability of honeycomb structure.