Aiming at the problems that existed in the process of certain gas turbo-generator set’s electronic assembly repair, such as long duration of fault detection, not guaranteed accuracy of detection results, a detection system for electronic assemblies used in certain gas turbo-generator set was established based on PXI bus and virtual instrument technology. The detection system has been applied in a factory to guarantee weapon equipment’s maintenance and support. The system was proved to be stable working, easily operated, and easily extended. With the help of the system, the failure could be located fast and accurately, the accuracy of fault detection of electronic assembly was improved greatly, the repair duration of weapon equipment was shortened, and the maintenance efficiency was raised, too.