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Vulnerability assessment is a method that find out weak link of microgrid to enhance its security stability, which neglet influences of Structural characteristics of power grid and distributed generation connected.Based on this situation, the node vulnerability of system with and without the Distributed Generation（Distributed Generation，DG）is compared and analyzed.A weighted integrated vulnerability indicator is proposed to assess the vulnerability of microgrid. Structure vulnerability put forward a method to evaluate node importance based on node degree and line reactance. Run vulnerability indicator includes voltage quality of each node and the active power balance of line. The proposed method has been tested in IEEE 33 bus systems with different types of DG, The effect of power system with Distributed Generation on system vulnerability is evaluated by comparing the effects of different types of DG and different parallel points. At last, simulation results verify the validity of the proposed indicators, and different types of DG can effectively reduce system vulnerability and improves the system's security.