In order to promote the application and development of farmland water-saving and the integration of water and fertilizer in Zhejiang, Hangjiahu plain paddy field was used as an example, the situation of water resources in Zhejiang Province, the significance of farmland water-saving and the integration of water and fertilizer were analyzed, and the main ways and methods of paddy field water-saving were explored. The results showed that water-saving could be realized by the use of atmospheric pressure tube irrigation system, which was cheap and had low water quality requirement, and the water-fertilizer technical proposal was also put forward. To carry out farmland water-saving and water-fertilizer integration technology could be in accordance with the simple and scale management of modern agriculture, and contribute to water- saving, emission reduction, efficiency increase and flood control and drainage in agricultural production, and reduce agricultural non- point source pollution. The technology would be the specific application and embodiment of the ‘comprehensive water treatment’project in agricultural fields of Zhejiang Province.