The Qiagong iron deposit is a newly discovered deposit,but geometric characteristics of its ore body such as the shape,size,strike,position,attitude and boundary have not been systematically studied.Based on a wavelet and multi-scale analysis of theoretical model data and measured data and a comparison of the application results between the upward continuation and the wavelet and multi-scale analysis,the authors hold that the wavelet multi-scale decomposition of magnetic anomaly can play an important role in search for deep-buried mineral deposits.