Abstract: The GIS software of MapGIS and Surfer are commonly applied in geologic research and exploration. However, the data of one sort cannot be adopted easily by each other. By analysis on the data file formats of Surfer and MapGIS, the paper proposes a method to convert the data between the two types of software. A conversion-software is complied. Particularly, the grid ASCⅡ file (DET) of MapGIS can be formed by simple editing, without transfer to grid. A practical program is made to draw the geochemical anomaly map by Surfer and then to convert into MapGIS format for publishing.