Abstract: Through the building of spatial database of Yunnan Province base on geological map and hydrological geological map, this paper gives a particular introduction of the four parts (the data pretreatment,the image vector, the space database processing and the files conversion) during the work,and makes summary for the typical question and their solution. The paper also makes a demonstration that the solutions are applicable to solve problems in the procedure of building spatial database on the other geographic information system platform.