Abstract: Structure characteristics of a combined compliant structure formed with a flexible hinge and a flexible beam are studied.The thickness ratio and the length ratio between the flexible hinge and the flexible beam are two characteristic parameters which influence deflection characteristics of the combined compliant structure.A group of combined compliant structures with different thickness ratios and length ratios are given, and their deflection is analyzed with the finite element method and the pseudo-body model, respectively.The influence of thickness ratio and length ratio on their deflection is discussed.Based on different values of the two characteristic parameters, the combined compliant structures are classified into different kinds.