The farmland irrigation project is an important part of China's water conservancy project. To keep abreast of the farmland water conservancy and various related environmental parameters, we can use the external sensors to acquire real-time data, employ the computer technology, networking and communication technology, database technology, GIS technology, component technology and other advanced modern information technologies combined with the automated water conservancy technology, in order to build an accurate, efficient, fast, comprehensive, standardized decision support system integrating farmland water conservancy and irrigation information collection, transmission, storage, management and analysis. In this paper, we give details about the overall framework design of farmland water conservancy and irrigation management system based on GIS, information collection and data input, and information processing and data output, to provide a reference for the digital water conservancy construction in China.