Smart water affairs is an important part of my country's smart city construction, and it is also a key development industry in my country's strategic level. Information technology has led to fundamental changes in the construction of water affairs informatization. Starting from the national big data development strategy, this article combines the status quo of smart city construction in Kunming, and investigates the main problems existing in the process of water informatization, and conducts research on the new generation of big data, cloud computing, and Internet of Things information technology, in-depth exploration and extensive use Water affairs information resources, the establishment of an integrated perception system of the sky and the ground, and the introduction of “water affairs brain” and “integrated brain” analysis technology, with “big perception”, “big network” and “big data” as the core, building water affairs information perception comprehensive and IT The foundation supports a safe, reliable, smart and effective smart water system for business applications, which will help comprehensively improve water management capabilities and promote the rapid, healthy and orderly development of smart water.