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The leakage property of mechanical seal is opposite to its friction property. In order to improve the reliability and prolong the service life of the mechanical seal, the controllability of mechanical seal must be studied to make the system run in the best condition. A precise mathematical model between leakage rate and friction torque can not be established, fuzzy control manner based on fuzzy set theory was used to develop monitoring and controlling device for mechanical seal. Most of papers about fuzzy control just expounded the design principle and schedule of fuzzy controller, and this paper completelySexpounds the design process of fuzzy control software for mechanical seal based on LabVIEW combining with theSactualSapplication.