提出了一种关于自由度平面闭链机构的构型方法，即“平面图形构造方法”。利用这种方法进行机构结构综合的主要过程是：先根据机械功能确定运动链的组成成分；再按这些成分构造平面图；最后在平面图上进行机构的构型和变异，并将其中结构最优者转换为机构简图。

This paper puts forward a kind of method about type synthesis of the one-dof planar closed chain's mechanisms, that is , “type synthesis by planar graph”.

The program of the method is that components of the chain are set up by the mechanical function first of all, then the planar graph is configured by the chain, finally the type synthesis and inversion of mechanisms are made by the graph, and the optimum structural kinematic scheme is formed.