The compliant micro- gripper is kind of mechanism used to amplify and transfer the micro-actuators displacement. The compliant mechanism accomplishes the transmission or transformation of motion,force and energy by the deformation of flexible components itself. The a fully compliant micro- gripper is designed and analyzed based on hinge stiffness. The gripper can achieve amplification of micro- displacement and ensure the output displacement with the horizontal direction. The relationship between the input force,input displacement and the output displacement of the compliant micro- gripper are established with the pseudo- rigid- body- model and virtual work. And the characteristics of the developed compliant mechanism are also modeled and analyzed with finite element method. The research indicates micro- gripper unilateral output displacement of up to 0. 989 mm when the material strength of the full compliant micro- gripper is limited the allowable range,and the conclusion of finite element simulation is consistent with the theoretical model. Transient behavior is continuous and smooth,and there is no mutation. It shows that the compliant micro- gripper has the good smoothness in the process of movement. By making and testing the prototype of compliant micro- gripper,the feasibility of this design is verified.