中文摘要：

研究了伪欧氏空间En＋1s中具有至多两个不同主曲率的2-调和超曲面.在假设形状算子可对角化的前提下,证明了这样的超曲面是极小的.

英文摘要：

In this paper,we studied biharmonic hypersurfaces of pseudo-Euclidean space En＋1s with at most two distinct principal curvatures.Assume the shape operator is diago nalizable,we proved that such hypersurfaces are minimal.