Abstract: This paper analyzes the general testing scheme for the secondary system of intelligent substations,extracts the functional performance supporting parameters involved in the test scheme,studies the key performance indicators of large-scale logic devices（FPGA） in the testing scheme,and proposes a feasible alternative scheme for the application of domestic FPGA in the testing systems of secondary equipment in intelligent substations.The scheme selects the mainstream large-scale logic devices of domestic manufacturers such as Unisplendour and Anlu Technology, conducting research on programmable logic resources,IP resources,lookup table resources, high-speed transceivers,EDA software,and other aspects.The research results show that autonomous and controllable large-scale logic devices have excellent performance in interface compatibility,big data processing capability,high-speed interface support,real-time performance,and other aspects,which can support the testing requirements of intelligent substation secondary systems.At the same time,the research results also provide solid theoretical and practical support for achieving complete autonomous and controllable testing of intelligent substation secondary systems.