The purpose of this essay is to explore the importance of muscles about human motion from anatomy. Then, we will be able to establish the mechanism by muscular characteristic. Muscles include agonist muscle and antagonist muscle. The skeletons can only be moved by the contraction of muscles. That unidirectional force characteristic is just like the resistant tensile force of rope. The rope can be just tensioned, it can¡¦t be pressured. The purpose of this essay tries to use unique method to apply the rope to the mechanism. The way is to use the input rod to contact the rope from lateral; then, the move of the input rod will force on the rope, resulting in the deformation and tension of rope. Therefore, the rope of two extremities of output rod will be moved. This above particular method is called direct contact of rope. In order to generate the generalized mechanical device of the rope mechanism, The essay defines the generalized rule of the direct contact of rope; thus, the rope mechanism can use create design of mechanism devices to proceed mechanism synthesis.