中文摘要：

确定合适的权函数是保幅偏移中非常关键的一个环节．在保幅偏移的过程中，进行绕射加权叠加，可以校正由于波的几何扩散引起的振幅损失，从而使地震偏移结果更为真实地反映地下界面的反射系数.本文对国内外已有的几种主要计算权函数的方法进行了整理和回顾，并分别论述了这几个权函数的适用范围和条件.通过这些对比，我们就能够根据不同情况，选择合适的权函数，从而更好的恢复出偏移剖面的反射系数.

英文摘要：

Selecting the suitable weight functions is a key step for amplitude-preserving migration. Applying weight function to the diffraction stack, we can compensate the loss in amplitude that is caused by geometrical spreading. Then the seismic migration results can describe reflector more clearly. This paper reviews several main methods of computing weight functions and analyzes the range and conditions of them. Through such comparing, we can choose proper weight functions according to different situations to image reflectivity better.