Abstract: Marine geological survey requires high precision geographic base map as working map forwork planning and map compilation.Due to the differences in working techniques, methods and working areas between the marine geological survey and the survey on land, in particular for the area covering both the sea and land, regional geological survey needs a specific geographic base map to better meet the needs in regional geological survey. Taking the 1:250 000marine regional geological survey in the Jinxi sheet and Yingkou sheet as cases, this paper discussed the compilation process of the geographic base maps with emphasis on some key technical points and the application of MAPGIS software.