Aiming at the problems that remote communication equipment in some air defense missile weapon system has complicated architecture, function test and maintenance difficulty, long repair cycle and unsure repair quality, a test system for the equipment is developed based on PXI bus, with the application of modular instrument and virtual instrument technology. The same hardware system and the same software development platform are adopted during the design of the open system architecture and standardization in test system．According to the characteristic of each unit under test (UUT), the different test and diagnose programs are developed. The test system has characteristics of high integration and extension and so on, and is already used in the formation of the maintenance line and emergency maintenance system.