Abstract: The components of geo-ontology and its hierarchical structure are analyzed,and the design method for sedimentary-ontology is presented,which is an important application case of stratum-ontology.Through the definition of stratum-ontology,the analyses of attributes of its application ontology,and the selection of described attributes of application ontology,the semantics contents and semantics relations of stratum-ontology are discussed,and the Backus Naur Form(BNF) description method for stratum-ontology.With the strata connection of Zhangxia group in the boder of Jiangsu province and Anhui province,the case of sedimentary-ontology and its applications in borehole data integration and strata-relation judgment are introduced,which gives a preliminary introduction to the study of geo-ontology and its application in geosciences and geo-engineering,especially in regional borehole date integration for digital mine and digital geology.