This article compared the traditional control method of automatic water system, designed the electrical control system based on PLC control which has the advantages of high reliability, strong anti-interference ability, convenient programming, ease of use, etc., developed the scheme of using the programmable controller to control the water supply system of water tower, completed the hardware and software design of electrical control system, including PLC model selection, assignment of I/O ports, I/O hardware wiring diagram drawing, PLC ladder program design. This article also elaborated the water supply process of water tower based on PLC control, and gave the corresponding control schematic.%文章在对比了传统的自动供水系统的控制方法，设计了基于PLC控制的电气控制系统，具有可靠性高，抗干扰能力强，编程方便，易于使用等优点，制定了采用可编程控制器控制水塔供水系统的方案，完成了电气控制系统硬件和软件的设计，其中包括PLC机型的选择、I/O端口的分配、I/O硬件接线图的绘制、PLC梯形图程序的设计。文章对PLC控制水塔供水工作过程也作了详细阐述，并给出了相应的控制原理图。
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