Abstract: The match probability of automatic grid service composition is improved by Low Match Degree Service Composition Method(LMDSCM) based on semantic illation, similitude degree and graph search. With the concept aggregate degree based on domain ontology defined, it is used to the calculating of service composition and building of service composition graph. The optimize of service composition is transformed to shortest path problem Finally, comparisons of efficicncy and satisfaction shows that LMDSCM has higher satisfaction degree than other method and is easy to produce best service composition project.

Key words: Grid service, Service detect, Service composition, Domain ontolo}v, Semantic match