The invention discloses an ontology-based power grid dispatching regulation stipulated knowledge modeling method and a power grid dispatching regulation stipulated knowledge modeling system. The method comprises the following steps of performing word segmentation on a power grid dispatching regulation stipulation text to obtain a plurality of concept entities; obtaining a hierarchical relationshipamong the concept entities; and constructing a corresponding power grid dispatching knowledge ontology according to the hierarchical relationship among the concept entities. The power grid regulationand control knowledge ontology constructed by the invention can be searched and matched according to a scheduling scene and a demand input by a dispatcher so as to achieve an auxiliary decision-making effect. Corresponding knowledge specific content can also be given according to search of knowledge keywords by dispatchers to serve as a role of an electronic knowledge base.