The present invention discloses an electrical power system prevention dispatching and recovery dispatching coordinative optimization policy construction method. The method comprises the steps of: establishing a prevention dispatching model and a recovery dispatching model by taking the consideration of a plurality of new elements/new features, taking prevention dispatching and recovery dispatchingas defenders, taking extreme weather as an electric system attacker, combining the impact of the two types of models and the extreme weather in a defender-attacker-defender multi-layer safety game model, and constructing a coordinative optimization policy of impact caused by responding to the extreme weather by employing the models. Compared to separated consideration of prevention dispatching orrecovery dispatching, the policy after coordinative optimization can obviously reduce the total outage loss of the electric power system under the impact of the extreme weather.