Abstract: Through analyzing 1∶50 000 aeromagnetic anomalies and other geophysical characteristics,the authors got to know that the Xiarihamu copper?nickel deposit shows weak magnetic anomaly in the aeromagnetic anomaly map,and shows medium strong magnetic anomaly in the geomagnetic anomaly map.The basic?ultrabasic complex has moderate magnetism,whereas pentlandite,pyrrhotite and some other minerals have strong magnetism which is in the main residual magnetism.Copper?nickel ore is the main factor causing the magnetic anomaly,and the magnetic anomaly is a direct prospecting mark in search for such deposits.Aeromagnetic anomaly has im?portant significance in search for magmatic liquation copper?nickel deposits.There are many aeromagnetic anomalies in Eastern Kun?lun area,suggesting that this area has the potential to find magmatic liquation copper?nickel deposits.