Abstract: Using the integral equation method,the apparent resistivity anomalies in three-dimensional ellipsoidal model with different position and shape inside and borehole region under cross-borehole condition are calculated.Based on the obtained simulation result of typical numerical value and with the help of information section of apparent resistivity anomaly,the anomalies are analyzed and studied,and the anomaly features and their variation regularity are summarized,and on this basis,the anomaly features of other models are analyzed and distinguished.