Abstract:According to different geological objects and different detecting depths, different scales of geophyical measuring will be chosen. During the same scale measurement, due to the abnormal differences in detail, abnormal shape is not the same when collecting the same geophysical datas with different scales. In order to reflect the abnormal range and shape of underground geological bodies as accurately as possible, the grid model will be selected correctly. It will make later anomaly interpretation more accurately. In this paper, how to choose the right parameters of geophysical data has been introduced.