There are important significance for regional magnetic interfaces to the structure unit division, resource calculation, regional geothermal field research, play prediction and so on in a basin. With the help of regional magnetic data, the basement uplift and the top-and-bottom depths of the interfaces of the regional magnetic formations can be obtained. There are close relation between the reliability of the geological top-and-bottom depths calculated by power spectrum method and the sizes of the sliding windows and the matched frequency bands. The study shows that when calculating the geological body with depth of h, the window size of the magnetic force should be 4 - 6 times of the depth, the scope of the matched frequency bands can be chosen and determined by the experiment; the horizontal size of the geological body has little effects on the calculation results. On the contrary, the buried depth of the top of the geological body, its thickness and the corresponding extent between the windows and geological bodies have played main roles.%区域磁性界面对于盆地构造单元划分、资源量计算、区域地温场研究、远景区预测等具有重要意义.利用区域磁力资料可以得到盆地的基底起伏和区域磁性层的顶底界面深度,应用功率谱法计算地质体顶底深度的可靠程度与反演磁力数据的滑动窗口、拟合频段范围有很大关系.研究表明,当计算埋深为h的地质体时,磁力数据窗口的大小应为4～6倍的埋深,拟合频段范围的选择可通过实验确定；地质体的水平尺寸对埋深的计算结果影响不大,起主要作用的是地质体的顶部埋深、厚度以及窗口与地质体的对应程度.
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