Abstract: Based on the understanding of geological work and the practice of geological informatization research for years, the authors in this research systematically discussed the basic connotation of geological informatization, and divided the development process of geological informatization into three stages as digitalization, networking and big data era, with the summarization of the main characteristics and landmark achievements of geological informatization in each stage. Besides, 10 representative achievements of geological informatization in the past 20 years have been proposed, in aspect of geological data resource construction, geological work mainstream informatization, geological data sharing and information service, geological information infrastructure construction, and geological information application in major projects. The achievements of geological information are believed to be rich, and adaptable to contemporary development, which made important contributions to the improvement of quality and efficiency and modernization of geological work. The defects in geological informatization, such as the diversity of data formats, the difficulty of integration, and the insufficient integration of information technology with geological research, have been analyzed. The development directions for the geological informatization were proposed, including strengthening the research of geological data model and data collection standards, integrating the data resources, perfecting the digital geological survey system, optimizing the information model and the deployment mode of management information system, and improving the framework of “Geo-Cloud”.