With a wide range distribution of CINRAD, the work of repair and maintenance became increasingly important. The virtual instrument system used in radar parameter index test is a convenient and effective tool. Starting from the transmit RF pulse envelope and the measurement, a PXIbased virtual instrument system is described. The system achieves the test and measurement functions through LabVIEW software programming. The virtual instrument test system hardware and software systems are introduced, and the pulse envelope testing tasks are conducted through experiments. Compared with traditional instruments, the results of virtual instrument test system proved reliable.