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本文针对分区性水文要素如降水量、地下水埋深等计算面平均值的问题，提出了一种计算机解法。该方法用矩形网格划分研究区域，利用标志数据文件识别各个分区，应用三角网法、趋势面法等方法求算矩形网格节点值，最终得到各个分区的水文要素的面平均值。经实际验证，效果令人满意。在几种拟合方法中，三角网法具有物理意义明确、使用简便、精度高的特点，为首选之方法。
In this paper, we propose a computer solution to the problem of partitioning hydrological factors such as precipitation and groundwater depth. The method divides the study area with a rectangular grid, uses the logo data file to identify each subarea, calculates the node values of the rectangular grids by using the triangular mesh method and the trend surface method, and finally obtains the average of the surface hydrological elements in each subarea. The actual verification, the effect is satisfactory. In several fitting methods, the triangular network method has the physical meaning of clear, easy to use, high precision features, as the preferred method.