It is difficult in symbols exchange and share between various GIS platforms because of different symbols in GIS platforms. Based on point symbol library, we conducted the structural analysis in two common map symbols in ArcGIS and QGIS. The TrueType Font is converted into Scalable Vector Graphics(SVG)through Python programming, and the point symbol is made by mark combination. The converted symbols have the same functions as ArcGIS, and thus can meet the mapping requirements of QGIS. The point symbol complete transformation is achieved in the ArcGIS earthquake disaster symbol library, which saves time for artificially symbol making. The technique we proposed in this paper can meet the actual demand of seismic, and has a good development prospect in other industries.