Abstract: Any planar multi-link non-dyad complex mechanism can be transformed into dyad mechanism with increasing number of degrees-of-freedom by the method of imaginarily disconnecting certain links and pairs. According to the geometric identity conditions established for the transformed dyad mechanism, the position analysis of the original mechanism can be carried out with high accuracy via successive linear interpolation .According to the velocity and acceleration identity conditions, the velocity and acceleration analysis of the original mechanism is easy to accomplish via the principle of linear superposition .This method of kinematic analysis is quite easy and general. In the paper two examples are given to show the effectiveness of the method.