The supporting role of a dispatch log system in dispatch operation is limited by its irrational information model. In view of the current demands of East China power grid real-time dispatch， an event-oriented dispatch log information model is proposed by twice object-oriented reconstructing the original information model， which is conducive to the hierarchy cognition and weakness identification of the power grid， and a new dispatch log system is built in accordance with this model. The effects of reconstruction show that the event-oriented dispatch log information model is worth promoting for its capability of increasing the efficiency of dispatch and reducing the possibility of maloperation.