MAPGIS is powerful and its map Library management provides technical support for joining many 1∶200 000 geochemical anomaly maps. This paper discusses both the characteristics of the 1∶200 000 geochemical data and the functions of MAPGIS’s map library management. The describing of applying map library management to merge different 1∶200 000 geochemical maps is also given in this paper. The method realizes another applying mean of 1∶200 000 geochemical data.