Abstract:based on GIS technology, after fininshing splicing and integration of geological information by using already digitalized geological maps with the scale of 1∶50000, soluting inconsistency of geological bodies in neighbor zone of neighboring maps, and fully using new achievements of geological map with the scale of 1∶200000 and1∶250000, splicing of six geological maps with the scale of 1∶50000 in Guanshui, Shuidao, Yazi, Fengjia, Rushanzhai and Rushan city in Shandong province have been completed. Through practices of splcing work, the overall level of geological mapping has been improved. It will provide a mathematical basis for scientific and effective research in this area.