The Guangdong-Hong Kong-Macao Greater Bay Area is composed of two special administrative regions of Hong Kong and Macau and nine cities of Guangzhou，Shenzhen，Foshan，Dongguan，Zhuhai，Huizhou，Jiangmen，Zhongshan and Zhaoqing. It covers a land area of 56000 square kilometers and is the world of national construction. It is one of the world’s four largest bay areas that are comparable to the New York Bay Area，the San Francisco Bay Area，and the Tokyo Bay Area in Japan. The economic and social development of high-intensity loads in the Guangdong-Hong Kong-Macao Greater Bay Area for decades has seen rapid development of various water environments，water ecology，water resources，and water disasters. At present，the utilization rate of water resources development has reached 38.3%，which is close to the internationally recognized warning line of 40%. In order to solve the contradiction between supply and demand of water resources in the Pearl River Delta and comprehensively guarantee the safety of water supply in the Guangdong-Hong Kong-Macao Greater Bay Area，the Party Central Committee and the State Council decided to build a water resource allocation project in the Pearl River Delta. However，it is extremely difficult to construct large-scale water conservancy projects in the Greater Bay Area. As a forefront of mature market economy and technology-driven development，Guangdong Province needs to break the rules and explore a new path for water conservancy projects in a new era.