This paper presents a topological technique for the sensitivity calculation by means of singal flow graphs theory. In our signal flow graph

the branch gains for the input branches and the intermediate branches are the nonlinear function of the system parameter for finding the sensitivity. According to the definition of summing matrix and branching matrix

and by using the Tellegen’s theorem for singnal flow graph

the general expression has been developed. The key to this technique is to calculate the sensitivity by direct application of the topological structure of the signal flow graph. The existing results may be considered as special cases of the general expression proposed in this paper. Finally

the application of the expression is illustrated by a concrete example.