Manipulative operations of rheological objects can befound in many industrial fields such as food industry and medical product industry. Automatic operations of rheological objects are eagerly required in these fields. In this paper, deformation transition graphs are proposed for the forming operations of theological objects. First, a novel forming machine with multi degrees of freedom is developed for the automatic forming of rheological objects such as dough and paste. Second, we will introduce a deformation transition graph so that the forming process can be described. We will then develop a method to generate the deformation transition graph through experiments. Finally, we will explain a forming control method of a rheological object based on the deformation transition graph.