Based on "Auxiliary angle Method",this paper studys and develops the new atlas of centric planar crank-and-rocker mechanismand its application research in visualization.

This paper researches and solves the graphic method of planar crank-and-rocker mechanism under the condition of travel velocity-ratio coefficient K=1,rocker oscillating angle Ψ and two of the four link sizes is given.

Based on the research fruit of "Auxiliary Angle Method",this paper puts forward the theoretical plot for setting up a set of performance and design atlas of planar crank and rocker mechanisms,and develops a software SCARMDC capable of automatically producing the new atlas.

This paper makes deep and systematic researches on the theoretical task according to travel velocity-ratio coefficient K and allowable transmission angle,and draws some conclusions of guiding significance for the analysis and synthesis of type Ⅰ as well as type Ⅱ planar crank and rocker mechanisms.

This paper give out one kind of practical graphic methord used to design planar crank rocker mechanism under the condition of knowing the rockearm length L 3 ,the swinging angle Ψ ,the speed proportional coefficient of strocks K and the crack length L 1 or the connecting rod length L 2 .