Abstract: The compilation of small-scale geological maps with medium-large scale data is an important content in the construction of national basic geological data.However, conventional digital mapping methods have some problems of large repetitive workload and time-consuming work.With the application of big data technology, cloud computing and artificial intelligence in the field of geosciences, intelligent geological mapping technology based on GIS platform came into being.This study is based on an intelligent geological mapping system named "iMapower" MapGIS version driven by expert knowledge and database.The intelligent mapping process of basic geological maps of 1:50 000 to 1:250 000 has been established.A blank area (Tianshuijin) mapping of 1: 250 000 scale was selected as a mapping pilot in Beishan of Inner Mongolia to provide an example for intelligent geological mapping in other areas.It has been approved that the intelligent mapping method based on the "iMapower" can significantly improve the mapping efficiency.It can also avoid many man-made errors during automatic computer processing, and the data quality has been effectively improved.