To achieve the intellectuality of the working process of manufacturing system in the power system, in this paper, the technologies of ontology, semantic reasoning, data mining, and so on are combined to build a power system oriented semantic workflow reasoning framework. The ontology concept and relation models of the workflow and the system resources involved in this framework were constructed, then the relationship between the power production demand information, the ontology workflow and power system re-sources are set up. And the trigger reasoning rules of workflow generating is researched...