The dispatching decision information of power flow distribution under the wildfire disaster needs to consider the disturbance of the internal fault of the power grid and the influence of external factors. Aiming at the current situation of current dispatching decision information disposition, combined with the mechanism of line faults caused by wildfire disasters, an event evaluation system based on grid state, equipment status and weather conditions is established, a treatment method of dispatching decision information for power flow distribution based on decision tree is proposed. The process of decision making of power flow allocation scheme is illustrated by an example. The results show that the method is effective and improves the comprehensive capability of power grid dispatching emergency.