Abstract: In view of the traditional unitary service mode of geological data and difficulty in data sharing, the paper puts forward a transformation plan of geological data management, and discusses the knowledge organization form, retrieval of knowledge service-oriented geological data and guidance of knowledge management concept for geological data service. With the construction of geological data ontology, the semantic organization of geological data based on associated data technology and construction of knowledge retrieval model based on geological big data as the transformation means, the semantic description and data association technology to promote transformation and upgrade of geological data are introduced to provide a reference for transformation of geological data management.