Abstract: Geological outcrop is an important object of geoscience research. It is difficult to save data, record details, observe completely of a geological outcrop by the traditional means, with the research goal becoming more and more refined and complicated. To solve these problems, photography, 3D modeling and construction of digital outcrop were applied to the study of outcrop. It provides a new idea for solving the problems such as low efficiency, poor data reusability of traditional methods. The practice shows that a 3D digital outcrop can combines outcrop-related information such as text, pictures, videos, panoramas, documents and observation points with a 3D outcrop model. It enables geologists to research and acquire geological information more objectively and more comprehensively. And then it can be used for a variety of geological analysis such as observe macroscopic landform, judge stratum strike and occurrence, identify lithology and geological boundaries, and so on. Compared with traditional methods, the new method enables geologists to acquire more intuitive understanding of geological features and spatial-temporal characteristics of a outcrop. It also makes geological analysis, co-study and sharing a outcrop efficient and convenient. Overall, it provide a more efficient way to geological analysis, it also provide a new method of geological observation and geological analysis.