Abstract: With the integration of new energy into the grid, the voltage stability of the grid decreases and the weak links increase. In order to promote the healthy development and efficient utilization of new energy, this paper proposes a weak link identification method considering the dynamic characteristics of system components. Firstly, by studying the difference of reactive power characteristics between new energy and traditional units, the relationship between new energy penetration rate and static voltage stability limit of power grid is derived, and the influence of new energy penetration rate on power grid load margin is analyzed. Then, a simple system model with induction motor is studied, and the Jacobian matrix considering system dynamic characteristics is derived. Based on this matrix, modal analysis is carried out to obtain the weak nodes of power grid considering system dynamic characteristics. Finally, based on the actual operation data of a regional power grid, simulation analysis is carried out to identify weak links, verify the effectiveness of the proposed method, which can reveal the impact law of new energy integration on power grid, and provide theoretical basis and engineering guidance for new energy installation planning and scientific consumption.