Abstract:With the water resources management information system of Fujian province as a case, the paper systematically introduced the SaaS idea to present a kind of construction mode of smart water APP. The System architecture of smart water APP was designed based on business application platform of water resource management and its functional model was proposed by combining the methods of UML static modeling and dynamic modeling. Within this framework, a mobile application middleware ExMobi was used to develop an application platform running on the operation environment of iOS and Android. And then the business function model was embedded into the mobile application platform to construct a smart water APP system based on cloud computing The functions of this system were realized, etc., the monitoring information management, integrated information management, early warning information management, emergency information management, remind agents, news and announcements.