Abstract: In this paper, the authors discussed some issues related to construction of the national geological information service system in the age of big data, gave the concept model of the national geological information service system based on the typical cloud computing architecture, dealt with some problems related to integration of geological data resources from the perspective of geological information characteristics, probed into the node construction and interfaces of the system according to the status quo of China Geological Survey system, geology-related industries as well as geology-involved units and departments, and made the propose as to how the national information service system based on big data can boost the geological information sharing and attach equal importance to data and information knowledge services to serve the national construction and social economic development on the basis of a comparative study of the new features of geological survey information services in developed countries.