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The cooling and water supply system in a certain factory area can only operate in manual mode and cannot achieve automatic constant pressure water supply. It has high energy consumption, high equipment loss, and poor adaptability to flow fluctuations in the pipeline network; By redesigning the Programmable Logic Controller (PLC) program of the system, adding/subtracting pump logic control and pipe network pressure setting were carried out, achieving constant pressure control of the pipe network based on a frequency converter; The automatic rotation operation of the water pump is achieved through logical control and redundant configuration of the water pump wheel inspection; By enabling the water pump and manually setting the pressure of the pipeline network, the flexibility of system control has been improved; By optimizing the loading conditions of the water pump and the touch screen function, the interference of equipment failures on the automatic operation of the system was eliminated, and the robustness of the system was improved. After 10 months of operation verification, the system can work stably for a long time, and the cooling water supply pump group can save more than 20% energy, achieving intelligent control.