灌溉排水科学是研究水、作物、土壤和人工设施四者之间的关系,通过人工设施,调节水分,改良土壤,促进增产。因此,它是进行农田水利建设的科学技术基础。我国的农田水利是一项群众性的事业,科学技术在其中起到什么作用,发展中有些什么特点,如何确定今后的任务,这是进一步发展灌溉排水科学技术所要明确的问题。本文仅作初步的探讨。 Irrigation and drainage science is to study the relationship between water, crops, soil and artificial facilities. Through artificial facilities, water regulation, soil improvement and stimulation of production increase. Therefore, it is the science and technology foundation for farmland water conservancy construction. The farmland and water conservancy in our country is a mass project, and what role science and technology play in it, what are its characteristics in development and how to determine the task in the future are the problems to be further clarified in science and technology of irrigation and drainage. This article only for preliminary discussion.