This article presents the electronic and online auxiliary decision-making system of the grid Contingency Plans, aiming at the problems of low level of coordination in common grid fault handling plans and poor manual page review efficiency. Firstly, traditional contingency plan information is modularized and structured. Secondly, the file transfer between different systems is realized to ensure the safety of the power system, through the power system information interaction E language specification; Finally, according to the actual fault handling process of the power grid, an online verification and auxiliary decision-making system for power grid accident plans was designed and developed, to realize the electronic analysis, identification, push and verification of plans, and give the specific adjustment amount of the corresponding plans. The system provides the required information support for the dispatching operators of the power grid in the emergency state of the power grid fault.