The result of research on aplication of block- modular principle at synthesis of bar-mechanisms for rigid body guidance on a plane are submitted in dissertation. The statement that determines neces sary and sufficient condition of structural synthesis for these mechanisms is proved. The functional pro perties of modules jf the synthesized mechanism are established. The synthesis are carried out with using a grath theory. All the possible structural updatings of guide me- chanisms with minimal numbers of bars are deter mined on basis of a root tree and their mathematical models are received. The methods for solving non linear systems of synthesis equations are developed when 4 unknown parameters of each module define.
