Abstract: Geological maps are widely used and play a very important role in national economic construction.This paper analyzes the difficulties in the emergency use of the geological map and studies the key technology of rapid mapping to the national base geological map database.With the national basic geological map database as the data source, through a series of data integration operations, through ArcGIS platform, the rapid extraction of geological map data, and the symbol of geological map information, finally output thematic emergency geological map.Rapid output of geological maps can improve the efficiency of mapping and meet the requirement of rapid and automatic processing of massive data by different users.