Abstract: The concept of point-symmetry structures is proposed in this paper.Through studying the sy mmetrical characteristic of these special structures, it is discovered that point-symmetry structures can be simplified to half-structures to make the analysis as simple as axis-symmetry structures can, but the boundary conditio ns of their half-structures are different.

Key words: point-symmetry structures, half-structures, boundary conditions

摘要： 提出了点对称结构的概念.通过研究这种特殊结构的对称特性,发现点对称结构与轴对称结构一样也可简化成半边结构,使求解简化.但两半边结构的边界条件有本质不同.

关键词: 点对称结构, 半边结构, 边界条件