Beishan Mountain orogenic belt in Gansu Province is a part of the extensive Tianshan-Xinganling folded belt, located where Tarim-China-Korea plate is connected with the Kazakhstan plate. Magmatic activities are developed under special tectonic setting, and granite masses of different types and properties are widely formed in different orogenic stages and tectonic settings. The granites in Beishan Mountain of Gansu Province are divided into 4 types according to magmatic evolution, formation orders, and metamorphic-deformational properties detected during geological mapping in 1:250000 regional geological investigation. With different approaches, different mapping systems have been established.