The kinematics characteristic of planar-linkage mechanism is analyzed based on mechanism theory. Through digital modeling and dynamic simulation technology, a functional simulation model of crank-rocker mechanism is set up, and then the design parameters of kinematic are obtained. Because boundary conditions of the finite element model is defined through seamless input of dynamic loads on Simulation modules, stress and deformation analysis of individual component and different subassembly are realized conveniently, and the accuracy and reliability of the statics analysis is improved effectively. Frequency and vibration mode of the mechanism in limit position are calculated through modal analysis. Besides, modal characteristic of the mechanism in limit position is optimized by ANSYS software, and then dynamic characteristic of the mechanism is improved effectively.