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At present, the software of the control system of supersonic wind tunnel is designed with low accuracy and poor security. Based on PMAC, a new control system software of supersonic wind tunnel is developed and designed Language editor development and debugging program in XP platform, PMAC motion control card operation control program is selected, program coordination is carried out by XP system, data compilation of upper computer and communication model in the program is completed, program code is calculated and extracted under 64 function functions, PID calculation is carried out based on three independent wind parameters, and software in the computer is uniformly configured by integrated software To ensure that other software programs can perform their own work under the control of the program, the fame view configuration software is used as the operation basis of the program, and the C + + language is used to write and develop the monitoring program. The experimental results show that the accuracy of the software acquisition of the control system of the supersonic wind tunnel based on PMAC is improved, the monitoring range is large, and the monitoring fluctuation is relatively stable, which effectively guarantees the safety of the software program.