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The code of control system based on VB is too long, miscellaneous and inconvenient for modification, hence, it cannot meet the requirement of complex field experiments and later expansion. To solve this problem, a graphical programming language called LabVIEW is used to design control system of magnetic resonance sounding instrument. This system is designed with a top-down approach, all functions are made into modules so that the modues can be called by the top conveniently. The system can set the parameters, detect the state of instrument and control instrument operation, and process and save data. At the same time, the key techniques of instrument control through LabVIEW are studied.By validation, this system can meet the requirement of controlling instrument and realize all functions.Moreover, it has advantages of friendly interface, simple operation, stable and reliable performance, easy to modify and expand. [ABSTRACT FROM AUTHOR]