地圖簡化作業中，特徵物因考慮比例尺對地圖負載量及幾何精度的限制，必須進行地圖形狀的簡化與地圖內容的選取，而此種過程的結果即稱之爲簡化影響。本文係依據政府出版之六種不同比例尺地形圖（1/5仟、1/2.5萬、1/5萬、1/10萬、1/25萬及1/50萬）研究水系網簡化之影響，並探討影響水系網簡化之因素。從實驗例中發現，地圖簡化會影響河流數目及河流長度。造成此種現象之原因，除了地圖比例尺外，人爲因素對特徵物選取之不一致性亦是其主因。因此，本文將針對傳統人工編圖中，水系網簡化常發生之不合理現象進行分析，並提出合理的水系網簡化方法，俾利我國編圖作業之應用參考。

In Map Generalization, due to consideration of scale limitation on map load capacity and geometric accuracy of Features, the map shape generalization and map content selection shall be proceeded. The result of such process is called Generalization Effects. Based on this, this paper attempts to study on the impact of River Networks with reference to topographic map published by the government in 6 different scales (1/5,000, 1/25,000, 1/50,000, 1/100,000, 1/250,000 and 1/500,000) and studies the factor of river network generalization. It is discovered from experiment examples that map generalization will influence the number and length of rivers. The reasons of causing this condition, except for map scale, the inconsistency of human factor on selection of features is also one of the major factors. Therefore, this paper engages in analysis of unreasonable phenomena of river networks on traditional manual map compilation and provides reasonable river network generalization method to facilitate the reference on map compilation operation application for our country.