Abstract: This paper based on the theory of powerflow and the generalized probabilistic perturbation method, the path powerflow transfer ratio are solved, and the new concept and effective approach of path powerflow transfer probability for vibration transfer path systems in frequency range are presented. The powerflow transfer probability among vibration paths are described correctly and expressly in frequency range as uncertain factors are considered. The sensitivity of the system to uncertain factors is studied. It is supposed to study the sensitivity of the system to these parameters, to estimate the effect of the change of parameters, to improve design performance.