1607年8月利瑪實與徐光啟間關於西方水法的對話，導致日後熊三拔撰說〈泰西水 法卜其中第五卷係由徐光啟演說<水法或問>'本文擬探討此卷的歷史意義與影響。筆者發現，在〈乾坤體義﹒四元行論〉中，利瑪竇將朱熹開始經學傳統中的問答體戶「或問」，沿用到處理士人對五行與四元素悶的疑難與問答。徐光啟演說〈水法或問〉反映包括徐光啟在內士人與熊三拔間關於水理的疑難與問答，其歷史意義在於他成為首位中國士人在刊刻作品中，採用四元素說來拆解占星與五行說相闋的術數。在〈則草〉與〈格致草〉中，熊明遇在某些小節名稱中使用「演說」，並大量引用與改寫〈水法或間〉內容，反映他受徐光啟的影響，並將之擴延到諸多與星占有闊的現象上，進行自然知識考據的省思。質言之，徐光啟演說〈水法或間〉補上了耶穌會士作品與熊明遇對中國傳統占星氣加以省思聞遺失的聯結(missinglink)。

In August of 1607， Matteo Ricci talked with Xu Guangqi about western techniques of water control， which led to the publication of the Taixi shuifa (Western Methods of防zter [Control]) written mainly by Sabbathinus de Ursis,in which Xu Guangqi was responsible for 'extensively explaining' (yanshuo演說) its fifth chapter (juan卷)，entitled 'Questions concerning the methods of water [control]' (Shuifa huow水法或問). This paper aims at exploring this chapter's historical significance and impact. From the questions and answers of Chinese and Western literati featured in the chapter， it becomes clear that Xu Guangqi was the first Chinese scholar who adopted the Aristotelian Four Elements Theory to criticize the traditional astrology and divination techniques of the Five Phases (wu xing 五行)theory. In turn， Xiong Mingyu熊明遇(1579-1649) was influenced by Xu Guan呵，νextensive explanations' found in the Shuifa huowen. In his Ze cao 則草andGhi cao格致草， Xiong not only used the term‘extensive explana tions' several times but also quoted or paraphrased a considerable portion of the contents of the Shuhuowen. Furthermore， he extended Xu Guan's approach to a number of phenomena related to astrology， thus advancing the understanding of Western natural knowledge in China. In sun， this paper claims that Xu Guangqi's Shuifa huowen provides the missing link between Jesuit writings and Xiong Mingyu's critique of traditional Chinese astrology and divination.