This paper states the geographic environment and brief history of Ganzhou City, specially discussing the idea of YANG Junsong, the Master of Feng Shui, who planned and built Ganzhou City in the shape of tortoise and its cultural connotation. It analyzes the advantages and disadvantages of its site selection, and discusses the urban flood and flood control. It also expounds the history of urban planning and construction. Ganzhou City is regarded as an example and a book of city planning and construction in ancient China in terms of the masters’ selection of the site and construction of the city, the city walls with functions of military defense and flood control, and the urban canal system of Fushougou against water-logging, the historical streets and lanes, the cultural relics, landscapes, etc., which not only make Ganzhou City the birthplace of first urban scenic spots and splendid historical culture, but also embodies the great wisdom of ancient Chinese. Three masters, YANG Junsong, KONG Zonghan, and LIU Yi, are heroes in the history of urban construction of Ganzhou. This paper states the geographic environment and brief history of Ganzhou City, specially discussing the idea of ​​YANG Junsong, the Master of Feng Shui, who planned and built Ganzhou City in the shape of tortoise and its cultural connotation. It analyzes the advantages and disadvantages of its site selection, and discusses the urban flood and flood control. It also expounds the history of urban planning and construction. Ganzhou City is considered as an example and a book of city planning and construction in ancient China in terms of the masters’ selection of the site and construction of the city, the city walls with functions of military defense and flood control, and the urban canal system of Fushougou against water-logging, the historical streets and lanes, the cultural relics, landscapes, etc., which not only make Ganzhou City the birthplace of first urban scenic spots and splendid historical culture, but also embodies the great wisdom of ancient Chinese. Three masters, YANG Junsong, KONG Zonghan, and LIU Yi, are heroes in the history of urban construction of Ganzhou.