2.5D joint inversion of gravity and magnetic module in RGIS data processing software uses 2.5D human-computer interaction inversion method of gravity and magnetic anomalies,which has advantages of simple interface,convenient operation,and real-time display of inversional curve. Taking inversion of GanC-2011-0011 aeromagnetic anomaly in the Dunhuang area of Gansu Province as an example,this paper describes concrete methods of data import,parameter setting and modeling. The inversion result is basically in accord with verification result with drilling. It is shown that the inversion result is reliable.