Abstract: This paper analyzes the work content, work flow, and the data treatment scheme of engineering geology. We think that engineering geological data is a kind of typical Big Data,which can improve the ordering and sharing of these data through geological semantics and database technology. Through the geological syntax, patterns, CAD technology and 3d visualization technology, improve the efficiency and standardization of 2d geological drawing and the visual insight of geological structure. Through the multisensor data fusion and mining technology, improve the depth and breadth of geological monitoring application. Through the network technology, improve work efficiency and convenience of data sharing. Through the Double C pattern, integrate engineering geological data and various analysis. Thus the traditional engineering geological data flow can be remolded from data collection to data archiving, and achieve the goal of informatization and digitization.