The circuit board fault detection and diagnosis system, which was designed for neotype weapon equipments, not only could resolve the problem that external test resources were too limited ,while there were too many quantities and types of circuit board test signals, but also could find the fault slug. The system was made up of many adapters in structure, and used the date acquisition card scheme based on PCI bus for detection; The system finished the design of information bank for fault elements, fault slug detection and detection interface. To design the system, some enlightenment or real reference could be gained for other weapon equipment circuit board fault detection and diagnosis system.