An efficient ontology-based service searching scheme is put forward in this paper by introducing semantic information into grid systems. The ideas of ontology and OWL (Web ontology language) are applied to establish a uniform abstract concept model and standardization for grid services. We propose a general framework of ontology-based service discovery sub-system, which includes ontology storage module, context-based domain selection module and specific service matching module. Implementation policies are also presented in this paper. The efficient oftology-based service searching scheme is put forward in this paper by introducing semantic information into grid systems. The ideas of ontology and OWL (Web ontology language) are applied to establish a uniform abstract concept model and standardization for grid services. a general framework of ontology-based service discovery sub-system, which includes ontology storage module, context-based domain selection module and specific service matching module. Implementation policies are also presented in this paper.