This paper introduces the wide application value of the four-bar linkage mechanisms in this modern maneuverability of big radar,after analyzing the accuracy and simulating the impetus of two different four-bar linkage mechanisms.

With the integrating plane geometry knowledge and principle of relative motion,a method for proving and identifying the pattern of four-bar linkage is introduced.

A analytical synthesis method of four-bar linkage in the special configtiration, in which thecoupler curve has a five-point contact with its tangent (Burmesters point), is presented.

A visual program for synthesis problems of rigid body guidance flat four-bar mechanism with four-position is developed.

This paper analyzes the kinematical equation and program for a flat four-bar mechanism and designs its interface by software VC++6.

In the system, when the original piece of the mechanism was turning around, once the parameters of the components of the four bar linkage mechanism and the angular velocity of the original moving piece were entered to the text edit boxes of graphical interface, the change law curves of the displacements, the speeds and the accelerations of the followers can be output quickly.

The mathematic model of four bar linkage mechanism is constructed by means of complex vector,and the trajectory,displacement,velocity and acceleration of the four bar mechanism have been analyzed.