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Phototransistor has characteristics of voltammetry, light, temperature and power. Users should be familiar with its properties before using some type of phototransistor. So we need a tester which is portable, inexpensive, easy to operate.Based on LabWindows/C-VI ,which is designed of the feature on the photoelectric triode tester, It replaces the traditional analog electr onic circuit testing instrument with high-speed acquisition card and LabWindows/CVI ,on the basis of designing a virtual instrument testing scheme, a signal amplifying circuit is designed for processing the output signal, and then, it puts forward the methods for measuring photoel ectric triode properties. finally, it expounds the data processing of photoelectric triode tester in labWindows/CVI. It can accurately measure the volt-ampere characteristic curve and the illu mination of photoelectric characteristic curve .And the results is visually displayed on the instr ument panel. It can effectively avoid the bad influence of big parameters.