According to situation of wind power reactive power shortage and development trend of reactive compensation technology, to reasonably choose applicable performance reactive power compensation device requirements, this paper has proposed and developed a response time test system of dynamic reactive power compensation device based on virtual instrument technology. It uses signal conditioning circuit as the basic of hardware, PXI data acquisition platform as the core of the instrument, LabVIEW as the programming tool in the computer. The system which has functions of waveform display, data reading, signal analysis, data management and others has monitored response time characteristic of reactive power compensation device and a series of parameters and achieved a comprehensive on-line monitoring for the function of reactive power compensation device.