Abstract: In this paper, the node vulnerability of system with and without the wind farm is compared and analyzed. Two aspects of the vulnerability are mainly considered, one is to solve node critical voltage by using of improved nonlinear flow algorithm, then to calculate the state vulnerability of bus; another one is to calculate the structure vulnerability by assessing the node importance based on the complex network theory. Then a comprehensive vulnerability function is built by combing above two aspects and the power flow of power grid with wind farm is introduced simply. In the end, by taking IEEE14-bus system as example, the node vulnerability under different conditions is calculated by proposed method with the disturbance of line tripping.