地圖水系網簡化因受制於製圖用途、製圖比例尺、製圖地區及製圖資料等因素之影響，如何能適切的選取河數，一直是地圖工作者所關切的問題。有鑑於此，決定地圖水系網之選取指標，則成為當前地圖編繪之重要課題。本研究擬以臺灣地區河川為例，選取四十條主要、次要及普通河川，進行河流數目及河流等級之計測，並應用數理統計，導出各級河之簡化迴歸模式。祈能經由大規模河川樣本的調查分析，歸納出臺灣地區地圖水系網之簡化類型，以提供地圖水系簡化時之新的思考方向。

Because of the river network generalization is limited to such influence of factors as mapping usage, mapping scales, mapping areas and mapping data, how to select an appropriate number of rivers has been concerned by cartographers. Therefore, to decide the selective index of river network on the map has presently become a crucialissue of map compilation. The research plans to sample forty major and minor rivers in Taiwan to measure theriver order. The model of river generalization regression is induced with a statisticalmethod. By studying and analyzing a great number of the samples, the type of river network generalization in Taiwan can be hopefully induced and is expected to be a new thinking direction for the generalization of river network.