Pseudo-rigid-body model is an important way to analyze kinematic and dynamic performance of compliant mechanisms and synthesize. The beam-flexible hinge combined mechanism is essential flexible fragment. A compliant mechanism was designed by using flexible fragments to replace rigid members of pseudo-rigid model. Traditionally pseudo-rigid-body model did not consider the effect of geometrical nonlinearity and deformation of the beam,so there was error between pseudo-rigid-body model of LEMs and the actual. ...