At each iteration, a master direction is obtained by solving one direction finding subproblem which always possesses a solution, and an auxiliary direction is yielded by an explicit formula.

在每次迭代中，主方向是通过求解一个总有解的寻找方向子问题产生，而辅助方向是由一显式公式计算产生。

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In this paper, the author faced with iteration method which often USES in equation solving, mainly introduced the structure procedure of convergent iterative formula and illustrated by examples.

本文针对方程求解中常用的迭代方法，主要介绍了收敛迭代公式的构造过程，并通过举例加以说明。

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By formula deriving and data calculating, the errors resulted from the two different methods are obtained, and their effects on solving practical engineering problems revealed.

并通过公式推导及具体数据计算，找出两种不同处理结果的误差，及对解决工程实际问题的影响。

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