Abstract: A design-for-testability methodology of network oriented diagnostic test for PCBs is proposed.The PCBs designed according to this methodology not only can realize self-inspection at power up but also can be controlled by remote terminal, such as PC, through wireless or cable network.The remote terminals can start circuit test, control test process, review test flow, obtain test results, renew/update test procedures.It provides a practical and effective approach for high quality test of PCBs.