This paper,based on the studying of the ideas,characters and drawing method for the pololess velocity diagram,gives a new method to determine the velocities of planar mechanism the poleless velocity diagram method which is applied to bring about results speedily.

<ABSTRACT>:This paper deals with the principle and method of inspection on the geometrial undeformability of planer structures by poleless velocity diagram.

The AutoCAD software plotting middle, artwork data amount the author is applied specifically for reality are big, slow problem of consumer plotting speed, have suggested that a little practice handles artifice in culture, can help a consumer to improve the speed drawing the complicated artwork effectively.

The non-polar velocity-diagram method to determine the relations of the imaginary displacements of planer rigid-body system;

One kind new method to determine the internal force of the plane statically determinate truss-The non-polar velocity-diagram method

This paper presents non-polar velocity-diagram method that determines the velocities of the planer mechanism with many degrees of freedom.

On the basis of studying the characters and drawing method of the poleless velocity-diagram, this paper puts forward the ideas, characters and drawing method of the poleless acceleration diagram, and then gives a new method to determine the accelerations of planer mechanism.