中文摘要：

在线性方程组的系数矩阵A为对称正定（1,1）相容次序矩阵的条件下,得到了PSD方法的一个误差估计.在相同的条件下,也可得到SSOR的一个误差估计,且此误差估计与M.Madalena Martins结果一致.

英文摘要：

In this paper, a bound for the norm of the errors fo the PSD method is given under the condition that the coeffcient matrix A of the linear systems is symmetric positive definite and consistently ordered, we also can get the error of the SSOR under the same conditions which is same to the result given by M. Madalena Martins.