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以Saint－Venant方程组为基础，讨论了按Preissmann加权四点隐式格式进行离散所得的非线性代数方程组的Newton－Raphson迭代解法，对河网非恒定流用松弛迭代方法进行计算，并利用GIS MapInfo实现了计算结果的可视化。
Based on the Saint-Venant equations, the Newton-Raphson iterative method for nonlinear discrete algebraic equations under the Preissmann weighted four-point implicit scheme is discussed. The unsteady flow of the river network is calculated by relaxation iteration method. MapInfo enables the visualization of the calculation results.