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The spray system is one of the key subsystems of one ice wind tunnel, which is used for simulating the high-altitude cloud environment. The control precision and fast stability of the nozzle anterior water pressure is very important to improve the efficiency of wind tunnel test and the uniformity of cloud. The master-slave control network topology was designed base of a large number of equipment and scattered layout.The location accuracy of adjusting valve actuator, and the reliability of the control system was also devised, according to the high index requirement and the harsh environment. In addition, the characteristic of the multi-branch parallel pressure regulating system was analyzed, and then the control strategy was proposed. Finally, the precise and fast control of the spray water pressure was realized based on the segmented PID algorithm. The design method can be used as a reference for the design of wind tunnel system under complex condition and for the design of multi-branch parallel pressure regulating system.