Abstract: Some questions like the mutual communication among the components,interoperability and retrieval assembly automatization that based on component software development,and a lot of Internetware questions to be resolved,firstly the differences between OWL-S and WSMO and the composition conditions of SOA component library are analyzed;secondly an SOA component library localizer mechanism based on Ontology is proposed,which construts an index system of automatic checking and component serivce quality of optimal estimation the least square method and feedback mechanism.Also a localizer tree model of SOA component library addressing and facet classification is set up,on the basis of it,the niched ant colony-annealing-genetic algorithm is adopted to resolve localizer component tree,thus fully component automatic assembly and core concern separation of component and reuse of level granularity are implemented.Finally the availability of locating algorithm through experiment simulation is analyzed.