It is necessary to research a cheap and simple fixed water distribution device according to the current situation of the technology of low-pressure pipe irrigation. This article proposed a fixed water distribution device with round table based on the analysis of the hydraulic characteristics of low-pressure pipe irrigation systems. The simulation of FLUENT and GAMBIT software conducted that the flow of this structure was steady with a low head loss comparing to other types of devices. In order to improve the design efficiency, a program was made using Visual Basic. The system was user-friendly, flexible operation, convenient and able to meet the needs of different users.