The invention provides a short circuit current exceeding auxiliary decision method based on node impedance sensitivity which includes the following steps: obtaining on-line data or off-line data, obtaining connecting relation with a physical bus, arranging power grid and breaking current and short circuit current reducing measure at a priority level; calculating open circuit voltage and short circuit current of a fault point, determining and warning a short circuit current exceeding point within the scope of power grid; as to an exceeding bus, searching measures of reducing the short circuit current; calculating the node impedance sensitivity of each measure of reducing the short circuit current and sorting measures of reducing the short circuit current; forming and verifying the short circuit current exceeding auxiliary decision method. The short circuit current exceeding auxiliary decision method based on the node impedance sensitivity is achieved based on current limiting measures capable of changing the electric power network structure. If short circuit current exceeding exists under the current operation mode, factory stand connection mode, lines and running state of a unit are automatically analyzed, and auxiliary decision and advice are provided.