Considering the characteristics of treating air-polluted leaks, fire and explosion, and based on the rules engine technology and dynamic path planning, an emergency treatment system was developed, in which, having the spatial operator introduced to rules engine so as to enhance rules engine’s expression and analysis of spatial data, and then having a dynamic path planning for air pollution coverage area proposed so that basing on Drools. Net and ArcGIS, the whole system can be implemented. The application proves the efficiency and practicality of this emergency treatment system.