Abstract:In order to adapt to the new status and requirements of the Long March 4 series launch vehicle, further improve the test coverage of the control system and eliminate safety risks，technical research has been conducted on the test system of the launch vehicle control system. By sorting out the test system of the carrier rocket control system, a real-time monitoring system of carrier rockets based on PCI extensions for instrumentation (PXI) technology is proposed. The system is based on a PXI computer as the core, combined with analog data acquisition, digital data acquisition, real-time Ethernet and automatic data interpretation technologies, which can complete the debugging, testing and acceptance work under the background of the module. The test data shows that the test system has correct data processing, reasonable system matching, high measurement accuracy, and strong universality. It has a good application prospect under the high launch demand.