Cheng Xuan area is an ore- endowed mafic—ultramafic intrusions discovered in recent years in Gansu Province in the Beishan Orogenic Belt, which is highly similar and comparable to a series of magmatic deposits in the Beishan Mountains of Xinjiang in terms of the age of mineralisation, mineralisation characteristics, and ore- endowed rock phases. The discovery and systematic study of this deposit will kick off the exploration and study of magmatic copper—nickel ores in the Beishan Orogenic Belt of Gansu. The results of physical and chemical exploration show that the ore- bearing basic—ultra- basic rock body has the characteristics of high weight, high magnetism, high polarisation, medium—low resistance, and good Cu and Ni anomalies, etc. At the same time, combined with the age of metallogenicity, mineralised rock phases, types of mineralisation, and alteration characteristics, it proves that Chengxuan deposit is a typical Cu—Ni magmatic sulphide deposit formed in the Permian Period (295.6Ma).