Abstract： Based on the practice in research and development of technology and product design in watersaving irrigation engineering for years, a primary idea for developing irrigation hydraulics was proposed. The agriculture irrigation process can be divided into four stages, namely, water conveyance, irrigation, soil water infiltration and water absorption of plant. Water conveyance and irrigation are included in irrigation hydraulics. Soil water infiltration belongs to soil physics, but water absorption of plant is closely related to water physiology of plant. Therefore, the basic theory of agriculture irrigation consists of irrigation hydraulics, soil physics and water physiology of plant. Accordingly, the basic concepts, objects and methods in irrigation hydraulics were proposed. Irrigation hydraulics should focus on investigation into the laws of water stream motion in water conveyance and irrigation with an objective that water can be delivered into soil economically and efficiently as well as distributed evenly. The connotation of irrigation hydraulics mainly includes three parts: laws of motion of irrigation water, hydraulic calculation of irrigation system and evaluation of irrigation uniformity. The contents developed in irrigation hydraulics can be served as a basic theory of irrigation and guide the research and development of technology and product in irrigation engineering, eventually provides new approaches and means for the design of an irrigation project.
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