1. College of Geo- exploration Science and Technology，Jilin University，Changchun 130026，China; 2. Institute of Geology，Shougang Geological Exploration Institute，Beijing 100144，China

Potential correlation imaging method can obtain the location of the source rapidly． To reduce the impact of superposed anomaly on correlation imaging，the existing methods usually use residual anomaly or vertical derivative imaging． The authors add a data intercept window to truncate the data， and calculate the correlation coef- ficient based on window data to reduce the impact of adjacent field source and improve the resolution of imaging． The windows were selected by the values of correlation coefficient extremum to get more reliable imaging results． With the test of gravity models，it was proved that the method can improve the resolution of imaging． The method was applied to calculate the depth of a mine tunnel in Heiyugou of Huludao City，and the result was satisfactory．