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This paper proposes a kind of grid resource discovery model which is compartmentalized into three layers including ordinary node layer, super node layer and directory node layer, in order to reduce network traffic and enhance communications efficiency. In this model, mobile Agent is used to carry on the interaction between two layers. On the super node layer and the directory node layer, LDAP directory servers acts as a unified interface of the grid information's storage and access, and the metadata of ontology's concept cluster is used to describe the node information in the leaf nodes of the LDAP directory server. Thus, by using the LDAP directory structure, the ontology is introduced and a semantic grid of spatial information is constructed in order to enhance the intelligence of the grid resource discovery and obtain a better result. At last, resources' registration process in the LDAP server and the step of resource discovery is described.