Abstract: By three-dimensional electrical method numerical modeling of three models(the anomalous body in the front,the anomalous body in the back,the anomalous body in the front and the rear),this paper shows that there is a large deviation between the position of the apparent resistivity extreme value and the position of the anomalous body.Compared to the abnormal body in the rear,anomaly amplitude of the anomalous body in the front is small.The anomalous body can be identified by two different mapping methods.Application examples show that resistivity method can explore the anomalous body accurately combined with other advance detection methods.