Abstract: Based on the biological data and adjustment mechanism of human eyes,a biomechanical model was established. In which the haptics of intraocular lens were analyzed by structural topology optimization method,and then a basic framework structure was obtained. The results of kinematics analysis of the mechanism show that the maximum displacement of target element reaches the expected goal. A fully compliant mechanism was conducted in this paper by using finife element method,followed by displacement analysis and stress analysis. The analysis confirms that the mechanism design is capable of amplifying motion,and indicates that structure of haptics can be improved or designed by using topology optimization method,finite element method and design theory of intraocular lens. The output displacement of compliant mechanism is 3. 34 times higher than that of input after topology of this model.Meanwhile the forward displacement of optical part is increased and the visual quality can be improved theoretically as well.