中文摘要：

以符号集合{＋，-，0｝中的元素构成的矩阵4称为符号模式矩阵或符号模式．如果对于符号模式4，实矩阵A中的元素与4中对应元素的符号相同，则称A是4的一个实现．如果4有一个实现是幂零矩阵，则称4为蕴含幂零的符号模式．该文引入了一类符号模式矩阵，记为了芍P（3，n-3）．得出只sP（3，n-3）中所有偶数阶的模式都不是蕴含幂零的，并且给出了n=7阶这种形式的符号模式蕴含幂零的充要条件．

英文摘要：

A matrix A whose entries come from the set {＋,-,0} is called a sign pattern matrix, or sign pattern. If A is a sign pattern and A is a real matrix for which each entry has the same sign as the corresponding entry of A, then A is said to be a realization of A. A sign pattern is said to be potentially nilpotent if it has a nilpotent realization. In this paper, a class of sign patterns, denoted by FSP（3, n - 3）, is introduced. The authors determine all potentially nilpotent sign patterns in FSP（3, 4）, and prove that no sign pattern of even order in FSP（3, n - 3） is Dotentially nilDotent.