1. College of Geoexploration Science and Technology, Jilin University, Changchun 130026, China; 2. College of Application Science, Jilin Teachers' Institute of Engineering and Technology, Changchun 130052, China

The authors reform the conventional self-correlation filtering factor in the process of gravity and magnetic anomalies in search for the observed value in remaining local anomaly largest point automatically in each measuring line and taking it as the reference model, then making the sliding self-correlation treatment along the whole measuring lines. The study of theoretical model shows that the zero-contour of reformed filtering results can define the abnormal border preferably is strong in resolving power of horizontal anomaly superimposition, and can extract weak anomaly which is indiscernible in normal method. The study of filtering window shows that it is the best for self-correlation radius in 3��6 grid node distances. The authors find new prospecting area by treating the actual data using reformed self-correlation filtering factor.