At present，the contradiction between China’s socio-economic development and resources and environment is outstanding，per capita water resources are scarce，and the water shortage problem in cities in the Guangdong，Hong Kong，and Macao Greater Bay Area is prominent. Urgently，the application of next-generation information technology is required to drive the overall production and operation management of the water industry. Smart water is an important part of the construction of ecological civilization. It is a systematic project that provides important support for the optimal allocation of water resources and the scientific management of the water environment. It is of great significance for the realization of national water-saving cities and the conversion of old and new kinetic energy in the water industry. This article analyzes the status quo，problems，and policy support of smart water affairs in China，and studies the composition of smart water affairs systems and foreign developments. Taking the smart water affairs construction of Guangdong，Hong Kong，Macao Greater Bay Area （referred to as the Greater Bay Area）advanced water company as an example，this article explores the specific application and application of smart water services in business management links such as production management，pipeline control，water supply services，and operation management. Practice，thus looking forward to the future development trend of smart water affairs，has practical reference significance for water affairs enterprises and industry leaders.