Abstract: As there exists the problem of inefficiency and low precision caused by manual processing in the traditional processing of map face data in digital geological survey, the authors put forward the train of thought and method for automatic processing of map face data, and gave the appropriate processing framework. On such a basis, the DLiner software was developed. The operation of this software is simple. It can automatically process the routing PRB and digital factual datum map, and has some interactive error-checking capabilities. It can effectively avoid problems in the digital geological survey such as lower accuracy in operating the map face and some hidden errors. With the DLiner processing, the map face is beautiful and can reasonably reflect the geological phenomena, thus greatly improving the efficiency and reducing labor intensity. The software is well compatible with Mapgis and DGSS software.