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The theory of regional groundwater flow proposed by Tóth provides a quantitative analysis approach for the study of basin-scale groundwater circulation. This paper summarizes the development of the theory of regional groundwater flow from four aspects, compares the description of the theory of regional groundwater flow in foreign hydrogeology textbooks, and systematically summarizes the evolution of descriptions in the theory of regional groundwater flow in the four editions of the textbook "Fundamentals of hydrogeology" in Chinese published from 1986 to 2018. It is concluded that the textbook "Fundamentals of hydrogeology" plays an important role in promoting the study of regional groundwater flow in China. This paper also puts forward some scientific problems to be solved in the theory of regional groundwater flow and some suggestions to guide more young students to conduct research in this field.