Virtual instrument is using powerful personal computer graphics environment and online help function, the establishment of virtual instrument panel, the instrument control, data analysis, change the traditional instruments use and can improve the instrument's function and use efficiency. LabVIEW is virtual instrument development platform software, to equipment source level with its intuitive and simple programming style, many drivers, a variety of analysis and expression of function support. The paper proposes function and design of virtual instrument based on LabVIEW technology. Experiments show that this method has certain validity.