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利用区域重力、磁力资料采用功率谱法可以方便、快捷地得到一个新区或一个盆地的基底起伏、区域磁性层的顶底界面深度。区域磁性界面常常为磁性较强的火山岩顶底界面以及居里面，这对一个新区或一个盆地早期评价中的构造单元划分、资源量计算、区域地温场研究、有利远景区预测等具有重要的意义。应用功率谱法计算地质体顶底深度的可靠性往往与滑动窗口大小、拟合频段的选取有直接关系。研究表明，要计算埋深为ｈ的地质体，窗口的大小应为（４～６）ｈ，拟合频段根据模型实验确定；地质体水平尺寸对计算结果影响不大，起主要影响的是地质体的上顶埋深、地质体的厚度及窗口与地质体的对应程度。
The use of regional gravity, magnetic data using power spectrum method can be easily and quickly get a new area or a basin basement ups and downs, the regional top and bottom magnetic layer interface depth. Regional magnetic interfaces are often magnetically strong top-bottom volcanic interfaces and in-terrestrial surfaces, which is of great importance to the tectonic unit division, resource calculation, regional geotemperature field research and favorable prospect prediction in a new evaluation of a new area or a basin . The reliability of calculating the top and bottom depth of geological body by power spectrum method is often directly related to the size of sliding window and the selection of fitting frequency band. The results show that the size of the window should be (4 ~ 6) h, and the fitting frequency band should be determined according to the model experiment. The horizontal dimension of the geological body has little effect on the calculation results, and the major influence is on the geology The top of the body, the thickness of the geological body and the correspondence between the window and the geological body.